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S-Maxx owners manual 304

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1. The TRX 2 5 air filter is carefully designed to deliver maximum performance while protecting your engine from dust and dirt Use only the supplied filter You will not improve engine performance by switching to an aftermarket filter and you may risk engine damage due to poor filtration The TRX 2 5 air filter assembly consists of 3 pieces 1 A rubber filter base 2 A plastic housing consisting of a permanently assembled mesh cap and body 3 An oiled foam element You must clean the filter after every hour of runtime even if the filter looks clean Dust which is often too fine to see and dirt constantly move through the filter anytime the engine is running Even if you can t see dirt on the filter it is present inside the foam after any amount of runtime If you exceed the recommended cleaning intervals your engine will be damaged Engine damage or wear due to dirt ingestion is easy to detect and one of the top causes of premature engine failure Air Filter Cleaning Instructions 1 Remove the air filter from the carburetor bore by pulling the entire filter firmly to the side to release it Do not pull straight up 2 Disassemble the filter Pull the rubber base out of the filter body With the base removed the foam element is visible in the bottom of the filter body Pull out the foam element 3 Clean the filter parts by thoroughly washing all three pieces of the filter assembly in hot soapy water dishwashing deterge
2. OWNER S MANUAL MODEL 5109 Traxxas 1100 Klein Road Plano Texas 75074 Phone 972 265 8000 Toll free 1 888 TRAXXAS Traxxas U K P O Box 1128 Winterbourne Bristol BS17 2SH England Phone 44 117 956 1002 Internet www Traxxas com E mail support Traxxas com Entire contents 2004 Traxxas Traxxas S Maxx TRX 2 5 TQ 3 Top Fuel EZ Start Ready To Race Ready To Win and ProGraphix are trademarks or registered trademarks of Traxxas Other brand names and marks are the property of their respective holders and are used only for purposes of identification No part of this manual may be reproduced or distributed in print or electronic media without the express written permission of Traxxas 040401 Thank you for purchasing a Traxxas S Maxx Stadium Maxx nitro monster truck Traxxas engineers focused on the essentials of performance by putting plenty of horsepower in a lighter weight more agile monster The new wide Maxx suspension features multiple shock mounting adjustments adjustable ride height and powerful 4 wheel disk braking The transmission is lean and mean with extremely low rotational mass for faster throttle response and quicker acceleration Rear wheel drive further improves the horsepower to weight ratio for exciting racing action The S Maxx is a serious performance minded machine for a new breed of driving enthusiast Separate modules for reverse and 4 wheel drive operation allow customers to add optiona
3. Quick Start Getting Up to Speed 9 Gluing the Tires 10 Decorating Your S Maxx 11 The Traxxas TQ 3 Radio System 21 The TRX 2 5 Racing Engine 37 Driving the S Maxx 38 Adjusting Your S Maxx 42 Trouble Shooting Your S Maxx 44 Maintaining and Storing Your S Maxx 46 Index f gt vA 4 e e U ce A Carefully read and follow all instructions in this and any accompanying materials to prevent serious damage to your S Maxx Failure to follow these instructions will be considered abuse and or neglect Before running your S Maxx look over this entire manual and examine the truck carefully If for some reason you decide the S Maxx is not what you wanted then do not continue any further Your hobby dealer absolutely cannot accept a S Maxx for return or exchange after it has been run Throughout this manual you ll notice warnings and helpful hints identified by the icons below Be sure to read them An important warning about personal safety or avoiding damage to your S Maxx and related components Special advice from Traxxas to make things easier and more fun Refers you to a page with a related topic SS AD 4 47 A If you have any questions about your S Maxx or its operation call the Traxxas Technical Support line toll free at 1 888 TRAXXAS 1 888 872 9927 Technical support is available Monday through Friday from 8 30 am to 9 00pm central time Technical assistance is also available at
4. definition Piston The piston is the internal engine part that is attached to the upper end of the connecting rod and moves up and down in the cylinder sleeve The precise fit between the piston and the sleeve creates a seal that allows engine to have the required compression for combustion Port Ports are openings in the sleeve that allow atomized fuel to enter the combustion chamber and burned exhaust gasses to exit The shape and location of the ports are a large factor in controlling the engine timing and power output Priming Manually causing fuel to move from the fuel tank up to the carburetor This is sometimes necessary after the engine has been sitting for a long period of time and all the fuel has drained back to the tank On a Traxxas model this is done by holding your finger over the exhaust tip for one or two seconds while the engine is starting Punch A term that refers to how quickly the model responds to throttle input or how quickly it accelerates Rich A running condition where the engine is getting too much fuel for the available air It is better to run an engine slightly rich to increase engine life Excessively rich mixtures cause the engine to have sluggish performance with exaggerated blue smoke and unburned fuel coming from the exhaust RPM Abbreviation for revolutions per minute how many times the engine crankshaft spins in a minute Sleeve Internal engine part that contains the piston The precis
5. 13 Batteries Ni MH nickel metal hydride 13 Batteries NiCad nickel cadmium 6 12 13 30 Battery box 7 Battery compartment Transmitter 11 13 Battery holder 11 14 Bearings 44 Big Block 15 23 Binding 42 Body mount 7 Brake 19 Bulkhead 7 Bumper 7 Bumper mount 7 CA glue 9 Camber 38 Carb see also Carburetor 23 Carburetor 22 23 28 42 adjustments 28 barrel 23 fine tuning 35 slide 25 venturi 28 Caster 39 Channel 11 12 17 18 Channel number 12 Charger 6 30 peak detecting 30 timed 30 Chassis 7 Clean out 23 Cleaning 43 Clearing your frequency 12 Clutch bell 22 Combustion 28 Combustion chamber 23 Compression 24 42 43 Connecting rod 23 43 Cooling fins 23 Crankcase 22 23 Crankshaft 22 23 44 Cross brace 7 Crystal 12 18 Access Plug 7 Curbs 37 Customer service 4 41 Cylinder sealing 32 Decals 10 Differential 7 Drivetrain friction 37 Driving Tips 37 Dyno 23 E mail 4 Engagement pawls 41 Engine TRX 2 5 7 22 26 cutting out 34 break in 21 23 32 driving procedure 33 cooling 36 43 damage 27 detonation 34 failure 27 43 flooding 31 41 42 hesitation 34 life 42 43 maintenance 43 mount 22 overheating 34 performance 29 priming 25 32 42 revving 37 shut off 44 sluggish acceleration 34 stalling 25 32 34 42 43 temperature 34 36 terms 23 tuning 28 34 by temperature 36 Exhaust 5 22 Exhaust fumes 32 EZ Star
6. 24 Negative wire 22 Neutral center point 16 17 Neutral position 12 Nitro 24 content 24 26 percentage 26 compensating for 35 Nitromethane see also Nitro 24 O ring 24 Oil 6 after run 6 44 filter 6 WD 40 6 44 Oil Dampers see Shocks On Off switch 7 11 14 18 41 Over revving 37 Peak detection see Charger Pinch test 35 Pipe tuned 7 22 24 25 Pipe hanger 7 Piston 24 32 wrist pin 43 44 Piston and Sleeve 42 43 Pivot balls 38 Port 24 Positive Wire 22 Power Switch 11 Pressure Line 7 22 Priming see Engine priming ProGraphix 10 Punch 25 Quick Start 8 9 10 13 14 15 18 19 20 26 30 31 32 34 37 43 Radio interference 5 20 Radio System 11 12 19 41 adjustments 16 controls 16 range testing 20 rules 18 terminology 12 terms 12 Range 14 15 18 20 41 short 41 Receiver 11 12 41 cover box 7 15 41 Required equipment 6 Rich 25 29 Ride height 39 40 Rollovers 37 RPM 25 limits 37 Safety 5 Servo reversing switches 11 16 Servos 7 11 12 reversing 11 17 steering 7 11 17 19 throttle brake 7 11 16 17 19 Shipping 4 Shock Mounting Positions 39 40 Lower 39 Upper 40 Shock progression 39 Shock Tower 7 Shocks 7 38 Fine Tuning 38 Shuddering 41 Skid Plate 7 Sleeve 25 32 Slipper Clutch 7 38 43 adjusting 38 pegs 43 Smoke 34 Spring rate 40 Spur Gear 7 Stalling see Engine stalling Starter shaft 44 Starting s
7. engine under the terms of the Traxxas Lifetime Engine Replacement Plan ERP It could save you time and effort Details are in your model s documentation package The TRX 2 5 is designed to be easy to rebuild Critical engine components such as the crankcase crankshaft and engine bearings are made to extremely high quality standards and should under normal circumstances outlast multiple sets of pistons sleeves connecting rods and wrist pins reciprocating assemblies It could be more economical for you to continue to use your good bearings and crankshafts and simply replace the reciprocating assembly as needed Engine assembly is not difficult and replacing the reciprocating assembly does not require any special tools or skills 05 gt Your S Maxx requires timely maintenance in order to stay in top running condition Neglecting the maintenance could allow dirt deposits and moisture to build up inside the engine leading to internal engine failure The following procedures should be taken very seriously After each hour of running Clean and re oil the air filter The instructions for this procedure are on page 27 We cannot stress enough the value of cleaning your air filter at the scheduled intervals Clean the outside of the engine of accumulated dirt oil and grime Accumulated grime will decrease the engine s ability to cool itself After each running session Perform after run maintenance on the
8. one thousand one one thousand two and then stop Repeat this starting and stopping procedure until the second tank of fuel is nearly empty 3 When the fuel tank is nearly empty shut off the engine and let it cool for 15 minutes Tank 3 1 Driving procedure Gently pull the throttle trigger to 1 2 throttle over a 3 second count Then gently apply the brake to stop Count the three seconds out while accelerating one thousand one one speed by turning the idle adjustment see page 22 on the carburetor counterclockwise 3 When the fuel tank is nearly empty shut off the engine and refuel From here on you do not need to let the engine cool between tanks Tank 4 1 Driving procedure Gently pull the throttle trigger to full throttle over a 3 second count Then gently apply the brake to stop Count the three seconds out while accelerating one thousand one one thousand two one thousand three and then stop Repeat this starting and stopping procedure until the fourth tank of fuel is nearly empty 2 Apply the throttle gradually Your finger should not reach full throttle until the end of the three second count 3 Keep your driving smooth and consistent 4 When the fuel tank is nearly empty shut off the engine and refuel Tank 5 1 Driving procedure Gently pull the throttle trigger to full throttle over a 3 second count hold for 2 more seconds and then gently apply the brake to stop Count the five seconds out while a
9. engine This clears the engine of destructive moisture and other corrosive deposits This is extremely important for the life of the engine See page 45 for after run maintenance procedures Inspect the vehicle for obvious damage or wear Look for 1 Loose or missing screws 2 Cracked bent or damaged parts 3 Cut or loose wiring 4 Cut or kinked fuel lines 5 Signs of fuel leakage Inspect the gears for wear broken teeth or debris lodged between the teeth Other periodic maintenance Slipper clutch pegs friction material The slipper clutch pegs will wear over time and require replacement The life of the pegs depends on how the slipper clutch was adjusted and how the S Maxx was used If the slipper will not tighten or you are seeing signs of wear on the face of the gear then the pegs should be replaced Piston sleeve The life of the piston and sleeve will vary greatly with how the engine was used and maintained The piston and sleeve should be replaced when they no longer seal effectively loss of compression Symptoms include the engine being difficult to start when warm stalling when warm and stalling when throttle is suddenly closed to idle Replace the wrist pin and G clip whenever the piston and sleeve are replaced Connecting rod The connecting rod should be replaced when the piston and sleeve are replaced or after three gallons of fuel whichever comes first Also replace the piston wrist pin and G cl
10. engine is primed too long it will flood with fuel and stop turning 5 Once fuel reaches the carburetor the engine should quickly start and idle 6 Disconnect the EZ Start controller from the model 7 Proceed with the engine break in If your engine doesn t start see Troubleshooting Your S Maxx on page 42 Tank 1 1 Drive the model with the body off 2 Driving procedure Gently pull the throttle trigger to 1 4 throttle over a 2 second count Then gently apply the brake to stop Count the two seconds out while accelerating one thousand one one thousand two and then stop Operate the throttle trigger as smoothly as you can Repeat this starting and stopping procedure until the first tank of fuel is nearly empty 3 Look for thick blue smoke exiting the exhaust outlet If there is no smoke richen the high speed needle 1 4 turn by turning the needle counterclockwise 4 When the fuel tank is nearly empty shut off the engine by pinching the fuel line connected to the carburetor 5 Let the engine cool for 15 minutes Note If at any point the engine cuts out or stalls during gentle acceleration richen the high speed needle 1 4 turn by turning the needle counterclockwise Tank 2 1 From tank 2 forward the S Maxx should be driven with the body on 2 Driving procedure Gently pull the throttle trigger to 1 2 throttle over a 2 second count Then gently apply the brake to stop Count the two seconds out while accelerating
11. the excess fuel to be consumed by the engine Be sure the throttle is in the idle position You may have to pinch the fuel line closed for several seconds before the engine stops 2 Completely empty the fuel tank Use your fuel dispensing bottle to suck out the old fuel Do not mix the old fuel with your fresh fuel supply If you leave fuel in the tank transporting or handling your S Maxx may cause fuel to run into the engine 3 With the fuel tank empty and the throttle at the idle position try to start the engine The engine will most likely start and run for a few seconds as it uses up any fuel remaining in the engine and fuel lines 4 Once the engine stops clean the outside of the engine with compressed air or spray motor cleaner Once the engine is clean and dry remove the glow plug power wire glow plug and air filter 10 Open the throttle fully and spray a one second burst of WD 40 into the carburetor and into the glow plug hole Caution Wear safety glasses to prevent spray from getting into your eyes Place a rag or paper towel over the engine to catch any WD 40 that may come out the carburetor or glow plug hole Connect the EZ Start controller to the model and spin the engine for 10 seconds Remove the rag or paper towel and repeat steps 5 7 two more times Clean and re oil the air filter so it will be ready for use next time See page 27 for air filter maintenance instructions Replace the glow plug recon
12. the spokes of each of the wheels on your S Maxx From the factory the pivot balls are completely tightened into the suspension arms which give each of the wheels 1 of camber Unscrewing the bottom camber pivot ball with a 2 5mm hex wrench will increase the wheel s negative camber You should not adjust the top pivot ball unscrewing it will increase positive camber and will also change the wheel s toe in The S Maxx has adjustable suspension so that it may be optimized for different kinds of terrain and driving styles Fine Tuning the Shocks The eight shocks oil dampers on your S Maxx have tremendous influence on its handling Whenever you rebuild your shocks or make any changes to the pistons springs or oil always do it carefully and in sets front or rear Piston head selection depends on the range of oil viscosities that you have available For example using a two hole piston with lightweight oil will give you the same damping as a three hole piston with heavier oil We recommend using two hole pistons with a range of oil viscosities from 10W to 40W available from your hobby shop The thinner viscosity oils 30W or less flow with less resistance and provide less damping while thicker oils provide more dampening Use only 100 pure pn silicone shock oil to prolong seal life i From the factory the S Maxx uses 30W oil The ride height for the S Maxx can be adjusted by adding or removing the clip on spring pr
13. throttle is increased the low speed needle is Water Valve Controls Overall Flow High Speed Needle Pl Water Nozzle Controls Fine Flow Low Speed Needle pulled completely away from the needle seat leaving it fully open At that point fuel metering is entirely controlled by the high speed needle Again using our water hose example when the spray nozzle at the end of our garden hose is fully open then the main water valve can be used to adjust how fast the water flows The engine s performance is directly linked to the fuel mixture Richening the fuel mixture increases the amount of fuel in the air fuel mixture ratio and leaning the fuel mixture decreases the amount of fuel in the air fuel mixture ratio Lean Slightly lean fuel mixtures deliver stronger more efficient combustion and more power but with less lubrication e Slightly rich fuel mixtures deliver cooler running and more lubrication but with slightly less power Tuning the engine means finding the perfect balance between the two excellent power to meet your needs while maintaining good lubrication for long engine life The optimal fuel mixture setting is rich to provide a safety margin against having a lean condition if some variable changes such as the temperature from one day to the next General fuel mixture settings are measured by the number of turns the needles are turned out from fully closed The fuel mixture settings h
14. to the rims using CA tire glue to prevent the rims from spinning inside the tires You can glue the tires without removing the wheels from the truck For clarity these instructions show the process with the wheels removed 1 Remove a wheel from the S Maxx using the larger 8mm end of the glow plug universal wrench 2 Use your thumb to push the side of the tire away from the rim Place one or two drops of CA glue into the opening and release the tire Capillary action will draw the glue around the bead of the tire 3 Repeat step two at four or five points around the rim until the tire is completely secured to the rim Turn the rim over and repeat the process for the inside of the rim tire Repeat for the other 3 wheels 4 Reinstall the wheels making sure none of the axle pins have fallen out from behind the hex hubs Always wear safety glasses to prevent glue from splattering into your eyes The acetone in fingernail polish remover will remove excess glue from your fingers For best results while gluing clean the bead of the tires and the grooves of the wheels with denatured alcohol before applying glue This removes any mold release agent residue from the tires and wheels providing a better bond The main decals have already been applied to your Revo The extra decals provided are die cut for easy removal Use a hobby knife to lift the corner of a decal and remove it from the bac
15. an excessively lean fuel mixture or glow plug failure Fuel 10 20 The TRX 2 5 must have model engine fuel to run Traxxas Top Fuel is recommended Fuel is sold in quarts and gallons from hobby dealers The 10 and 20 labeling refers to the percentage amount of nitromethane contained in the fuel see nitro percentage definition Fuel mixture The ratio of fuel to air as determined by the needle settings of the carburetor Fuel tubing fuel line The thick silicone tubing that carries fuel from the fuel tank to the carburetor Glow plug The glow plug is located in the cylinder head at the top of the combustion chamber It contains a platinum element that glows red hot when voltage is applied When the engine is being started the heat from the glow plug ignites the fuel mixture and starts the combustion process Glow plug driver This tool clips onto the glow plug and supplies the required voltage to light the glow plug element It is also called an igniter EZ Start equipped engines do not require this separate tool Header The aluminum tube that connects the exhaust system to the engine exhaust port The length and diameter of the header must be carefully selected to extract the most power from the engine High speed needle Adjusts the carburetors fuel air mixture at high RPM Idle speed The speed RPMs the engine runs at when the transmitter s throttle trigger is at neutral Idle speed screw Located on the ca
16. andheld control unit the Motor LED and the Glow Plug LED should light green while starting If either LED fails to light while starting there is a fault indicated with that function If the Glow Plug LED fails to light the glow plug may be bad or the glow plug wire may be damaged or disconnected If the Motor LED fails to light and the starter fails to operate then the EZ Start is in protection mode Protection Mode The EZ Start uses Smart Start technology to monitor the condition of the system and detect failures The controller monitors the load being placed on the EZ Start motor If the load becomes excessive the system shuts off power to the motor to prevent costly damage to the motor and the controller This may occur for example if the engine floods with fuel during starting The starter spins at first but when excessive fuel in the combustion chamber begins to lock up the engine the starter motor slows under the heavier load This causes the protection circuit to shut off the power to the motor Allow at least 3 minutes for the starter motor to cool and the circuit to automatically reset before continuing Use the time to find and eliminate the condition that caused the excessive load on the starter motor When the EZ Start controller is in protection mode wait at least three minutes before attempting to start the engine to give the starter motor time to cool It s normal for your EZ Start control
17. ave been pre set from the factory to typical break in settings Do not readjust your carburetor from the factory settings until after the engine is started and running and you have been able to observe the engine running to assess what minor adjustments may be required to compensate for fuel temperature and altitude Adjustments are usually made in 1 8 or 1 16 turn increments The Idle Speed Adjustment The idle speed screw controls the closed position of the throttle slide When the throttle servo is in its neutral position the throttle slide should be stopped against the idle adjustment screw Always use the idle speed adjusting screw to control engine idle Do not use the throttle trim on the transmitter to adjust idle speed The idle speed should be set as low as possible and still maintain reliable running for Best Performance on page 34 for complete information on adjusting the air fuel mixture and idle speed ey See Tuning the TRX 2 5 TRX 2 5 Factory Needle Settings If your factory preset carburetor adjustments have been tampered with use the following settings Set the high speed needle to 4 turns out from closed Set the low speed needle so the screw head red in Fig A is flush even with the end of the slide yellow in Fig A Needle Adjustment Always use the factory settings for initial starting Only use these settings when the factory settings have been lost Installing the EZ Start Ba
18. break in procedure can be different for different makes of engines Follow the Traxxas directions for break in exactly Carb Abbreviation for carburetor Carburetor The carburetor atomizes mixes the fuel with the air so that the engine can burn it There are two types of carburetors slide carbs and barrel carbs The TRX 2 5 uses the superior slide carburetor design Clean out Cleaning out is a condition that occurs when the engine is accelerating and the fuel mixture becomes sufficiently lean to allow the engine to continue into its upper RPM power band Usually characterized by a noticeable decrease in blue exhaust smoke and a dramatic increase in engine speed Combustion chamber The combustion chamber is machined into the bottom of the cylinder head This is where the glow plug ignites the fuel The shape of the combustion chamber is designed to promote more efficient burning of the fuel Connecting rod The connecting rod transfers the piston motion to the crankshaft The TRX 2 5 Racing Engine uses a knife edged connecting rod The aerodynamic sharpened edges allow it to slice through the pressurized air fuel mixture inside the crankcase Cooling fins The cooling fins are molded into the cylinder head and crankcase and cause heat to be drawn away from the engine Heat is removed when it dissipates into the air passing across the cooling fins It is important to keep the fins clean of dirt and debris for maximum
19. ccelerating Repeat this starting and stopping procedure until the fifth tank of fuel is nearly empty 2 When the fuel tank is nearly empty shut off the engine and refuel Tank 6 During the sixth tank of fuel the engine can be tuned for general performance use Proceed to the next section in this manual As you gain experience in the hobby you may discover that many people have differing opinions on what is the proper procedure to break in a model engine Only use the Traxxas break in procedure Other break in procedures could result in a weak damaged or otherwise poor performing engine The procedure outlined here was extensively tested and proven to yield better performing engines than other common break in methods Even if you have years of experience using model engines please do not ignore this caution 1 4 2Seconds 15 Minutes Off Apply throttle gradually 1 2 2Seconds 15Minutes On Apply throttle gradually thousand two one thousand three and then stop Repeat this starting and stopping 1 2 haga rl the third tank of fuel is 3 1 2 3 Seconds On Reduce idle speed if necessary nearly empty z rer r 2 As the engine loosens the idle speed may 4 Full 3 Seconds On Keep your driving consistent increase and cause the model to try to creep 5 Full 5 Seconds On Accelerate over 3 second count forward when stopped Reduce the idle hold for 2 seconds When adjusting the low speed fuel mixture iti
20. compressed air toward your skin See page 35 for O more information on how air density affects engine tuning Understanding the Carburetor adjustments The carburetor performs several functions It controls the engine s speed by restricting the intake of air and fuel into the engine It atomizes the fuel suspends the fuel droplets in the air and also controls the air fuel ratio of the mixture entering the engine how much air for a given amount of fuel To help provide a better understanding of engine tuning and why it s necessary the following is a brief explanation of the air fuel combustion process that takes place inside the engine In order to create the cylinder pressure that results in power the engine burns the air fuel mixture Both air and fuel in correct amounts are needed for proper combustion It is the carburetor s job to mix the air and fuel together atomize the fuel in the correct proportion for the best possible combustion This is the ideal air fuel ratio The ideal air fuel ratio required for the engine remains roughly constant Due to variations in atmospheric conditions temperature humidity altitude etc fuel flow adjustment valves called fuel mixture needles are required to meter the fuel and maintain the ideal air fuel ratio in these ever changing conditions For example colder air is more dense more air molecules for a given volume of air and therefore requires more fuel more fuel mole
21. cooling efficiency Crankcase The engine body that contains all of the running mechanical components Crankshaft The main shaft of the engine that contains the rotating assembly Cylinder head head The finned aluminum part on top of the engine that is responsible for dissipating most of the engine s heat The combustion chamber is machined into the bottom of the head Dyno Abbreviation for dynamometer A precise piece of testing equipment that accurately measures engine power and torque output over the engines entire RPM range EZ Start Second generation Traxxas on board electric starting system The system consists of a hand held starter control unit and an on board gearbox with an electric motor to spin the engine The new EZ Start contains many performance and reliability improvements over the first generation EZ Start Filter foam The oiled foam element inside the air filter housing The filter foam in the TRX 2 5 must be thoroughly cleaned and re oiled after every hour of run time Fit Usually refers to the fit of the piston and sleeve If the fit is tight then the piston will feel very tight at top of the sleeve and the engine will have good sealing and compression If the fit is loose then compression will be low and the piston and sleeve should be replaced to the TQ 3 Radio System on page 12 D Learn terms related Flame out Occurs when the engine stops running at high RPM Usually the fault of
22. ct battery installation 14 u5 The radio receiver in your S Maxx uses 4 AA batteries The battery holder for the receiver batteries is located underneath the battery cover The battery cover can be identified by the on off switch 1 Remove the battery cover by removing the two 3x10mm roundhead self tapping screws from the cover 2 Remove the battery holder and install 4 AA alkaline batteries Make careful note of the battery polarity by comparing against the diagrams in the battery holder 3 Insert the battery holder into the battery cover To On Off Switch 4 Reinstall the battery cover and secure with the screws see sidebar You must install the antenna mast tube before you operate your S Maxx You ll find the plastic antenna tube and tip in the bag with your manuals and documentation 1 Locate the black antenna wire that exits the receiver cover The S Maxx receiver cover is mounted on the top of the chassis near the front Pull the wire straight with your fingers and then insert the end of the wire into one end of the antenna tube Push the wire all the way through the antenna tube Pull the remaining wire through the antenna tube and then insert the base of the antenna tube into the molded post on top of the receiver cover Fold the remaining antenna wire over the top of the tube and secure it with the antenna tip On the transmitter always fully extend the telescoping anten
23. cules to maintain the correct air fuel ratio Warmer air is less dense fewer air molecules and therefore needs less fuel to maintain the correct air fuel ratio The tuning needles are there to adjust how much fuel is made available for the carburetor to mix with the available air atomization Dense Air Less Dense Air The amount of fuel metered and atomized by the carburetor is controlled by the two mixture needles the high speed needle and the low speed needle The low speed needle is used to meter the fuel used by the engine at idle and low RPM part throttle engine speed The high speed needle is used to meter the fuel when the throttle is open from part throttle to wide open throttle WOT Two needles on the TRX 2 5 provide precise control of the air fuel ratio across the engine s entire RPM range The maximum possible fuel flow is always controlled by the high speed needle It works like the main water valve ona garden hose Turn it clockwise to close the valve counter clockwise to open it When the throttle is at idle or partially open the low speed needle again meters the fuel flow at the outlet needle seat where the fuel enters the carburetor venturi This second valve acts like the spray nozzle at the end of the garden hose in our example When you accelerate from idle the throttle opens and the low speed needle is pulled away from the needle seat This allows more fuel to flow with the increased air flow As the
24. d for a long period then some of the important fuel components could have evaporated Try new fresh Traxxas Top Fuel Try anew Traxxas 3231 glow plug Sometimes a glow plug will work well enough to start the engine but not be able to deliver the engine s full performance potential Check to make sure there is no binding in the driveline that would cause excessive loads on the engine Clearing a Flooded Engine If the engine is primed for too long during startup then it can become flooded with fuel When the engine is flooded it will no longer turn due to excess fuel in the combustion chamber preventing upward movement of the piston Use the following procedure to clear a flooded engine 1 Remove the blue glow plug wire 2 Remove the glow plug and gasket with the glow plug wrench supplied with your model A 5 16 nut driver will also work 3 Turn the model upside down and plug in the EZ Start controller 4 Push the EZ Start button for several seconds to clear the engine of excess fuel 5 Turn the model over and reinstall the glow plug and gasket 6 Reconnect the blue glow plug wire to the glow plug 7 Reconnect the EZ Start controller 8 Do not prime the engine Pull the throttle to 1 2 throttle and push the EZ Start button The engine should start immediately ifthe engine is worn or damaged enough to require replacing the piston sleeve or connecting rod consider exchanging your old engine for a brand new
25. d the transmitter Loss of the radio damagejto youre Man P iienea le aoi 5 signal can cause you to lose control of your S Maxx using the same channel as you S g y y i E channe 3 Orange There are six possible channels Channel 4 numbered 1 through 6 Each is Yellow represented by a color Look at the l f Channel 5 crystal plugged into the back of your ores transmitter to determine which channel channel 6 your truck is assigned to Always turn your TQ 3 transmitter on first and off last This procedure will help to prevent your S Maxx from receiving stray signals from another transmitter or other source and running out of control Always have the transmitter and receiver turned on before you start the engine Never turn the radio system off while the engine is running The on off switch in the model only turns the receiver on and off It does not turn off the engine The TQ 3 Radio System was pre adjusted at the factory The adjustment should be checked before running the model in case of movement during shipping Here s how 6 Operate the throttle trigger on the transmitter and check for rapid operation of the throttle servo When the throttle trigger is pulled back the carburetor should open When the throttle trigger is pushed all the way forward the brake should lock 1 Fully extend the chrome antenna mast on the transmitter 2 7 Once adjustments are made turn off the receiver on your and turn the
26. e Be careful not to touch the parts especially when refueling or stopping the engine Prolonged exposure to the engine exhaust can be harmful Avoid breathing the engine exhaust Always run your S Maxx outdoors in a well ventilated area Never run the engine indoors Don t operate your S Maxx at night or anytime your line of sight to the model may be obstructed or impaired in any way Never operate your S Maxx in crowds of people or busy pedestrian areas The S Maxx is large and fast and may cause injury to those unaware of its presence Because the S Maxx is controlled by radio it is subject to radio interference from many sources beyond your control Since radio interference can cause momentary loss of control always allow a safety margin in all directions around your model to prevent collisions The engine can be loud If the noise makes you uncomfortable wear ear protection Be considerate of your neighbors by not running your model early in the morning or late in the evening Most importantly use good common sense at all times All instructions and precautions outlined in this manual should be strictly followed to ensure safe operation of your S Maxx The S Maxx is not intended for use by those under 16 years of age without the supervision of a responsible and knowledgeable adult For more info on D batteries see Use the Right Batteries on page 13 A peak detecting charger is recommended
27. e fit between the sleeve and the piston creates a seal that allows engine to have the required compression for combustion The sleeve in a TRX engine is made of brass and is then hard chrome plated Slide carburetor The throttle on a slide carburetor closes and opens by sliding a barrel in and out of the carburetor body This type of carburetor is preferred for performance use because it provides a less restrictive straight through air path than the barrel carburetor design Stall When the engine stops running usually due to an incorrect fuel mixture setting or running out of fuel Tuned pipe The tuned exhaust pipe usually consists of a specially shaped metal or composite chamber with baffles that is designed to enhance the power output of the engine Wear in Fitment process that occurs during engine break in where internal engine parts develop an even more precise matched fit through actual use under controlled circumstances WOT Abbreviation for wide open throttle You may use higher nitro percentages than 20 in certain circumstances Call 1 888 TRAXXAS for more information Use the Right Fuel It s imperative that you use the correct fuel in your TRX 2 5 for maximum performance and engine life Traxxas Top Fuel should be used to ensure correct engine lubrication performance and ease of tuning Traxxas Top Fuel has been proven in thousands of engines so you can count on it every day for great per
28. e load spacers Note that changes in ride height will occur when changes in shock angle or spring rates are made You can compensate for ride T height changes by changing the pre load ba spacers on the shocks gt Caster Adjustment The S Maxx offers the ability to adjust the caster angle of the front suspension aia Caster adjustment may be used to influence the understeer oversteer handling characteristics of the S Maxx Increasing the caster angle will increase the tendency of the truck to oversteer less traction on the rear tires more traction on the front tires while decreasing the caster angle will cause the truck to have a tendency to understeer push in the turns This effect becomes more pronounced at higher steering angles and higher spring rates Caster is adjusted by repositioning the shims on the pivot point of the upper suspension arms Caster adjustment shims 2 Front Caster adjustment shims 2 Rear Caster adjustment shims 1 Front 1 Rear Vertical Vertical oll we Ground plane Ground plane al Ground plane The stock caster setting is 7 degrees with one shim at each end of the arm Reduce the caster angle to 4 degrees by removing the rear shim and inserting it next to the front shim The caster angle can be increased to 10 degrees by removing the front shim and inserting it next to the rear shim Shock Mounting Positions Big bumps and rough terrain require a softer suspension with
29. e rear of the body windshield and front valance If the engine temperature still cannot be kept below 270 F richen the high speed needle slightly A Your TRX 2 5 Racing Engine is broken in the fuel mixture is balanced and the idle is set now it s time to have some fun This section contains instructions on driving and making adjustments to your S Maxx Before you go on here are some important precautions to keep in mind Don t run your S Maxx in water mud snow or wet grass It s tempting but water and mud are easily drawn through the air filter and will severely damage the engine Small amounts of moisture can cause electronics to fail and loss of control over your S Maxx The TRX 2 5 is extremely powerful Remember to apply the throttle gradually to prevent wheelies or loss of control Don t hold the S Maxx off the ground and rev the engine excessively with no load on the engine This practice could result in internal engine damage Avoid over revving the engine when the S Maxx is airborne after a jump Avoid excessive high speed running for extended periods of time or over long distances This could cause the engine to build up enough speed to exceed maximum safe RPM limits Don t drive your S Maxx with drive train damage of any kind The engine could be damaged due to overloads on the engine caused by drivetrain friction or over revving caused by loose or missing parts Don t tow anything with your S Maxx The e
30. ee Engine starting Steering mechanism 19 Steering Trim Electronic 11 12 17 19 Steering Wheel 11 19 Storage 44 Supplies 6 Support 4 41 Suspension adjusting 39 40 Suspension Arms 7 Tank 1 33 Tank 2 33 Tank 3 33 Tank 4 33 Tank 5 33 Tank 6 33 Temperature see Engine temperature Temperature gauge 36 digital temperature gauge 36 infrared temperature probe 36 Throttle Arm 22 Throttle Neutral Adjustment 11 16 Throttle response 35 Throttle slide 35 Throttle Trigger 11 16 19 Throttle Trim Electronic 11 12 16 19 35 Toe in 38 Tools 6 TQ 3 see also Radio System 11 Transmission 7 Transmitter 12 18 41 indicator light 19 power indicator 11 13 Traxxas Lifetime Engine Replacement Plan 43 Trim see also Throttle Trim and Steering Trim 12 Troubleshooting 41 Turnbuckle 7 Turns 37 39 Two Speed 41 access hole 41 adjusting 41 Understeer 39 Water 42 Wear in 25 Weather conditions 35 Wheelies 34 Wheels 9 Wiring diagram 11 WOT 25 28 X tal see also Crystal 12 Zero scrub radius 19 1100 KLEIN ROAD PLANO TEXAS 75074 1 888 TRAXXAS
31. eiver The radio unit inside your S Maxx that receives signals from the transmitter and relays them to the servos Servos Small motor units in your S Maxx that operate the throttle and steering mechanisms Three channel radio system The TQ 3 radio system consisting of the receiver the transmitter and the servos The system uses three channels one to operate the throttle one to operate the steering and a third channel which is reserved for shifting with optional reverse module sold separately Transmitter The hand held radio unit that sends throttle and steering instructions to your S Maxx Trim The fine tuning adjustment of the neutral position of the servos made by turning the throttle and steering trim knobs on the face of the transmitter Use the Right Batteries Your transmitter and receiver use AA batteries Use new alkaline batteries or rechargeable batteries such as NiCad or Ni MH nickel metal hydride batteries in your transmitter and receiver Make sure rechargeable batteries are fully charged according to the manufacturer s instructions Your TQ 3 transmitter uses 8 AA batteries The battery compartment is located at the base of the transmitter 4 Turn on the transmitter and check the power indicator for If you use rechargeable a solid red light batteries in your transmitter be aware that when they begin to lose their charge they lose power much more quickly than regular alkaline batteries Ca
32. el that s characteristic of a Traxxas Maxx Truck For easier access to the Spring rate at the wheel increases as the lower shock Spring rate at the wheel increases as the upper shock rear most shock mounting position is moved from position 1 to position 4 mounting position is moved from position A to position B mounting screw This is equivalent to using stiffer springs Use higher spring rate remove the one end of the settings for flatter terrain with smaller and fewer bumps and Ride height is not affected by changes in the upper shock rear turnbuckle In the front lower spring rate settings for bigger bumps mounting position remove the suspension pin from the lower front Ride height decreases as the lower shock mounting position is Use the chart below to see the effect of the various shock suspension arm to gain moved from position 1 to position 4 Each pair of lower shock mounting positions The horizontal length of the lines indicates easier access to the lower mounting holes 1 2 and 3 4 has equal ride height Use lower the amount of suspension travel The angle or slope of the lines shock mounting screws ride height for high speed cornering and flat terrain and when indicates the spring rate at the wheel racing on relatively smooth tracks Increase the ride height for rougher terrain and tracks Upper Shock Mounting Positions The upper shock mounting positions will have suspension effects opposite from the l
33. em terms They will be used throughout this manual Channel The 27 MHz frequency band is divided into 6 channels so that up to six models can be operated simultaneously Each channel is referred to by its flag color and channel number as shown below Channel Frequency Band Flag Color Traxxas Part No 1 26 995 Brown 2031 C Aa 2 27 045 Red 2032 a 3 27 095 Orange 2033 eH 4 27 145 Yellow 2034 5 27 195 Green 2035 6 27 255 Blue 2036 Clearing your frequency A routine verbal check to make sure nobody else in your area is operating on the same channel Always clear your frequency by calling out your channel number before operating your model Wait or move to another area if your channel is already being used Crystal X tal The plug in device that determines which channel the radio system will operate on For each channel there are two crystals one for the receiver and one for the transmitter Of those two crystals the one marked with the lower number 455 MHz lower must be inserted into the receiver Frequency band The radio frequency used by the transmitter to send signals to your S Maxx All Traxxas RTR models operate on a 27 MHz frequency band Neutral position The standing position that the servos seek when the transmitter controls are at the neutral setting NiCad Refers to rechargeable nickel cadmium batteries The most economical choice since they may be recharged up to 500 times Rec
34. emperature humidity and altitude The TRX 2 5 is manufactured to exacting tolerances and requires a specially designed break in procedure to accomplish the final precision fitting of the internal engine components It is very important that you follow the new break in procedure as closely as possible to achieve the best performance and longest life from your TRX 2 5 Racing Engine Old style break in procedures such as simply running the engine with a very rich fuel mixture for the first 4 tanks of fuel will not achieve the best results Follow the steps in this manual A routine maintenance schedule is also required to keep the TRX 2 5 in top running condition Cleaning the air filter after each hour of running is particularly important Also it is extremely important to perform after run maintenance on the engine to prevent corrosion from building up on the internal engine components see page 45 a RACING ENGINE _ Traxxas strongly discourages changing or modifying any part of the TRX 2 5 Racing Engine Old tech tips and tricks that may have boosted the power of other engines could seriously diminish the performance of the TRX 2 5 There s more advanced thinking development and testing in the stock parts of your TRX 2 5 than in many aftermarket manufacturer s so called performance parts The TRX 2 5 is already the most powerful engines in its class and simply will not benefit from average low tech afterma
35. ents in the fuel can evaporate very quickly and upset the balance of the fuel Do not store unused fuel in the fuel dispenser Immediately return fresh unused fuel back into the fuel can Do not mix old and new fuel Never mix different brands of fuel together Store the fuel in a cool dry location away from any source of heat ignition or combustion Read and follow the safety precautions on page 5 in this manual Filling the Fuel Tank Use a fuel dispensing bottle Traxxas Top Fueler part 5001 to put fuel into the S Maxx s fuel tank To fill the fuel bottle squeeze the air out insert the dispenser tip into the fuel can and release your grip on the bottle As the bottle expands fuel will be drawn into it To fill your model flip up the spring loaded cap on the fuel tank insert the tip of the fuel bottle and squeeze to dispense the fuel Fill the tank until the fuel level reaches the base of the filler neck Close the fuel tank lid making sure it closes tightly Fuel Tank Seal Adjustment The rubber seal on the fuel tank is important to the function of the engine The fuel tank is pressurized by the exhaust system to provide reliable fuel flow If the tank lid does not seal properly an air leak will be created that can cause your engine to run erratically and be difficult to start If necessary the rubber O ring tank seal can be adjusted for improved sealing by tightening the screw on the underside of the tank lid
36. factory If necessary adjust the control so that the carburetor is at idle and the brakes are not applied the model will roll freely Do not use the throttle trim to raise or lower the engine idle speed Make the idle speed adjustment on the carburetor Electronic Steering Trim The electronic steering trim located on the face of the transmitter adjusts the neutral center point of the steering servo when the servo is at rest Adjust this control to make the model drive straight with no steering input at the wheel Servo Reversing Switches The servo reversing switches are located on the front of the transmitter next to the on off switch Moving a switch reverses the direction of the corresponding servo Each switch corresponds to a channel as shown below For example if you turn the steering wheel to the right and your front wheels turn left you would move the channel 1 switch to correct the servo direction It may be necessary to adjust the corresponding trim control after moving a switch Channel Servo 1 Steering 2 Throttle and braking 3 Available for future use A 44 4 47 A Always use new or freshly charged batteries for the radio EO channel 1 system Weak batteries will limit the range of the radio signal Remember always turn the TQ 3 transmitter on first Each time you prepare to run your S Maxx you must clear your frequenc Brown i z endon lasttojavoid b 7 y h ile between the receiver an
37. for best performance and longest battery life For more information see Use the Right Charger on page 30 Your S Maxx comes with a set of specialty metric tools You ll need to purchase other items available from your hobby dealer to operate and maintain your model Your S Maxx comes with these specialty metric tools nNv 1 5mm hex wrench 2 0mm hex wrench Glow plug universal wrench Turnbuckle wrenches U Joint wrench Filter oil for the foam air filter see page 27 for details 12 AA alkaline batteries for the radio system 7 2 volt NiCad battery pack for the EZ Start starting system NiCad battery charger Traxxas Top Fuel 10 quart 5010 20 quart 5020 10 gallon 5060 20 gallon 5070 Fuel dispensing bottle Traxxas part 5001 Thin hobby quality cyanoacrylate instant tire glue often called CA glue Safety glasses 2 Phillips screwdriver 1 Phillips screwdriver Small flat blade screwdriver 1 8 inch blade Hobby knife After run oil WD 40 to protect the engine from corrosion Pressure Line EZ Start Motor Fuel Line EZ Start Plug Bumper Mount Body Mount Half Shaft Header Engine see pg 20 for details Fuel Tank g Lid Chassis Battery Steering Box ervo Slipper Clutch Fuel Tank Spur Gear On Off Switch Pipe Hanger Antenna Mount Air Filter S Transmission Receiver Pipe Box Access Plug for Receiver Crystal Thro
38. for 2 3 seconds speed up and then die 3 If the engine runs longer than 3 seconds then lean the low speed needle 1 16 turn make several more high speed runs and retest 4 Ifthe engine dies immediately without speeding up then richen the low speed needle 1 8 turn make several more high speed runs and retest When the low speed needle is set correctly the engine s throttle response should be very quick possibly even to the point of making it difficult to keep the S Maxx from doing a wheelie when you accelerate Idle Speed Adjustment Once the high and low speed mixtures have been set reduce the idle speed to the minimum reliable idle speed Remember this adjustment should be made while the engine is running at normal operating temperature 1 Turn the throttle trim on the transmitter so that the brakes are applied This ensures that the throttle slide is resting against the idle adjustment screw 2 If necessary remove the air filter to gain access to the idle adjustment screw 3 Turn the screw counterclockwise to reduce the idle speed or clockwise to increase it The idle speed should be set as low as possible while still maintaining reliable running characteristics 4 Reset the throttle trim on the transmitter Fine Tuning the Carburetor After fine tuning your TRX 2 5 Racing Engine at the end of the break in procedure no major adjustments to the fuel mixture are usually necessary Make note of the temperature hu
39. formance Top Fuel is the only fuel which is 100 certified for use in Traxxas engines Traxxas Top Fuel is made with just the right balance of the highest grade natural and synthetic lubricants to allow excellent throttle response and the best top end performance without sacrificing long term durability All of the components in the fuel are carefully selected from the best materials available and then custom blended to match the metallurgy and temperature characteristics of Traxxas engines You may use 10 or 20 nitro content fuel Use the same percentage all the time don t switch back and forth between 10 and 20 fuel If you break in your engine on 20 fuel then always use 20 fuel What about Other Fuels Can other brands of fuel be used besides Top Fuel There are other fuels that can provide satisfactory performance however there could be long term costs in the form of decreased engine performance loss of tuning ease and shorter engine life Everyone has an opinion or a claim to make about fuel The engineering team at Traxxas spent over 2 years developing the TRX 2 5 Racing Engine No one knows more about the specific fuel requirements of Traxxas engines than Traxxas engineers We strongly urge you not to take chances with your engine investment and use the Traxxas fuel made for the TRX 2 5 Handling the Fuel Follow all directions and warnings on the fuel can Keep the fuel tightly capped at all times Some compon
40. gine If neither LED on the controller lights the EZ Start battery could be discharged or improperly connected Inspect and recharge if necessary If the glow plug LED lights and the motor LED does not then the EZ Start controller is in protection mode Allow the controller to cool for at least three minutes The circuitry should automatically reset Check to make sure the wires are connected to the EZ Start motor in the S Maxx The red wire should connect to the positive motor terminal indicated by a red dot next to the terminal The engine could be flooded If too much fuel accumulates in the combustion chamber at start up the engine will hydraulically lock Follow the procedure on page 43 for clearing a flooded engine Check for binding at the engine flywheel If you are not able to turn the engine by hand the engine could be flooded there could be binding in the clutch system or there could be internal engine damage Note It is normal for the engine to be extremely tight and hard to turn when the piston reaches the top of the compression stroke Engine extremely sluggish hard to start and will not idle during tank 1 of the break in It is possible that the factory adjusted break in settings on your carburetor are too rich for your geographic location atmospheric conditions or fuel brand Extremes in temperature humidity barometric pressure and altitude can t always be accounted for with a single high speed needle set
41. here is no longer any performance improvement If any one of the following conditions occurs the fuel mixture is already past the maximum safe lean setting 1 There is no longer any performance improvement 2 The engine begins to cut out at high speed Danger 3 There is a sudden loss of power during acceleration Danger 4 The engine begins to overheat Symptoms of overheating include Steam or smoke coming from the engine not exhaust Hesitation or stalling during acceleration Popping or clattering sound when decelerating detonation Fluctuating idle speed Temperature measurement above 270 F at the glow plug Richen the fuel mixture to the optimum setting by richening the high speed needle at least 1 8 turn counterclockwise and retest This setting will extend engine component life High Speed Power Loss Overheating LEAN Cutting out stalling Optimum lt RACING for High Speed Performance __ EVERYDAY Optimum RUNNING for Climbing amp Low Speed Operation SAFE RANGE RICH Sluggish Performance Break In Settings Low Speed Fuel Mixture Adjustment The low speed mixture is always set after the high speed needle is correctly adjusted The low speed mixture will be set using the pinch test 1 Once the engine is warm do several high speed runs to confirm that the high speed needle is set correctly 2 Bring the vehicle in and pinch closed the fuel line going into the carburetor The engine should run
42. include Cutting out or sudden loss of power during acceleration Overheating temperature beyond 270 F at the glow plug Little or no blue smoke coming from the exhaust If any of these conditions are present stop immediately and richen the high speed mixture 1 4 turn The engine will probably be slightly rich at that setting and you can then retune for performance Always tune for performance by starting rich and moving leaner toward the ideal setting Never try to tune from the lean side There should always be a light stream of blue smoke coming from the exhaust Before you begin tuning the engine should be warmed up to its normal operating temperature and running slightly rich All final tuning adjustments must be made to the engine at its normal operating temperature You can tell the engine is running rich by noting any of the following Sluggish acceleration with blue smoke coming from the exhaust There is unburned fuel spraying from the exhaust tip Leaning the high speed fuel mixture increases performance High Speed Fuel Mixture Adjustment With the engine warm and running at a rich setting gradually lean the high speed fuel mixture in 1 16 turn increments Make several high speed passes with Revo after each adjustment to clear out the engine and note any change in performance The TRX 2 5 is extremely powerful Remember to apply the throttle gradually to prevent wheelies or loss of control Continue this procedure until t
43. ip whenever the connecting rod is replaced As with other internal engine components connecting rod life depends engine s usage and the quality and frequency of the engine maintenance EZ Start The cush drive elements in the EZ Start drive unit should be inspected after 3 gallons of fuel If the cush drive elements appear deformed or hardened they should be replaced Inspect the EZ Start gears for any signs of wear Damaged gears should be replaced Coat the gears with a thin layer of white lithium grease After run Procedure You must perform after run maintenance on your Traxxas engine whenever the model will be stored for longer than a few hours Taking the time to prepare your engine for storage will reward you with longer engine life easier starting and better performance When a nitro engine is shut off some excess unburned fuel remains in the engine The methanol in model engine fuel is hygroscopic which means it easily attracts and absorbs moisture This moisture can cause rust and corrosion on the steel engine parts crankshaft bearings wrist pin and starter shaft if the fuel is not removed from the engine There are after run oil products available from your hobby dealer or you can use WD 40 a common household lubricant To ensure your TRX 2 5 Racing Engine is protected from internal corrosion use the following procedure 1 Whenever possible shut off the engine by pinching the fuel line closed This allows most of
44. king Carefully position the decal over the desired location and press one side on the body Pull the decal tight and use a finger to gradually smooth out any air bubbles as you apply the decal Look at the photos on the box for typical decal placement Your S Maxx model 5109 is equipped with the TQ 3 Radio S Maxx Wiring System The TQ 3 is a 3 channel system that provides high power Diagram Positive output up to a quarter mile and control for up to three servos Black A The S Maxx makes use of two channels for throttle brake and Negative steering The third channel is reserved for future upgrades with U optional reverse module and third shifting servo available On Off Antenna Throttle Neutral Adjust Antenna Switch Steering Wheel Red Your S Maxx can be outfitted with full reversing capability by installing the optional reverse module sold separately 4 Cell Battery Holder separately Receiver Throttle Trim O w Steering Trim o ana g Channel 3 Channel 1 Steering Servo y Channel 2 Channel 1 D Battery 3rd Channel Switch Throttle Trigger Channel 2 Throttle Servo Servo Reversing Switches Power Indicator Power Switch Reserved for optional shift servo and reversing module Battery Compartment Learn terms related to the TRX 2 5 Racing Engine beginning on page 23 Please take a moment to familiarize yourself with these radio syst
45. l performance features to their Stadium Maxx A three channel radio system is already installed to make upgrades easy Plus nothing has more accessories and customization options than a Traxxas Maxx truck The S Maxx s new TRX 2 5 Racing Engine is the most powerful engine of its size ever available in a Ready To Race truck Two years of engineering development and advanced design along with thousands of hours of testing puts the TRX 2 5 in a class by itself Each part of the TRX 2 5 from the air filter on the slide carburetor to the tip on the dyno tuned exhaust system has been carefully engineered to provide maximum power over the broadest RPM range Traxxas was the first with standard on board electric starting The new second generation EZ Start has evolved into an incredibly advanced and reliable starting solution featuring thermal protection for the motor and built in diagnostics to monitor the condition of the glow plug Obviously there s much going on between the wheels of your S Maxx In this manual we ll take you step by step through all necessary set up break in tuning and operating procedures Even if you are an experienced R C enthusiast it is important for you to read and follow the procedures in this manual Pay particular attention to the fuel genuirements and break in procedures The advanc i ti l fz Before You Proceed Safety Precautions Tools Supplies and Required Equipment Anatomy of the S Maxx
46. ler to become warm after repeated use See page 43 E for information on clearing a flooded engine to Remember on page 5 for other precautions D See Important Points Never run your S Maxx indoors Since the TRX 2 5 Racing Engine exhaust fumes are harmful always run your S Maxx outdoors in a well ventilated area Your TRX 2 5 Racing Engine doesn t usually require priming If you do need to prime your engine watch the fuel line carefully to avoid flooding your engine See page 43 for information on clearing a flooded engine Your carburetor is pre set at the factory to give the correct air to fuel ratio and idle speed for engine break in Do not adjust the carburetor unless you observe a poor running condition that requires correction The TRX 2 5 uses a ringless aluminum brass chrome ABC piston sleeve construction This type of engine design relies on a very precise running fit between the piston and sleeve for cylinder sealing Engine break in is necessary to allow the piston and sleeve to develop an extremely precise fit and optimum cylinder sealing Therefore proper engine break in is critical to achieving the fastest most reliable engine performance Allow yourself about 1 to 1 2 hours to complete the break in procedure The engine break in period will take 5 tanks of fuel ina S Maxx The break in time is not the time to impress your friends with your new S Maxx You must wait
47. level causes the mixture to run too lean This could result in a burned glow plug or extremely high engine temperatures Keep extra glow plugs handy Traxxas part 3231 The break in process can cause deposits to form on the plug leading to plug failure Follow the instructions exactly for each of the first 6 tanks of fuel Starting Your TRX 2 5 Racing Engine for the First Time Before you start your TRX 2 5 Racing Engine for the first time make sure you have read all instructions and precautions in this manual Pay close attention to the tank by tank break in instructions in the next section and make sure you have read and understood them before you run your engine Your engine must be at room temperature 70 F or 21 C or above the first time you start it If it s cooler than room temperature outside keep your S Maxx indoors until you re ready to start it then take it outside 1 Turn on the radio system according to the instructions on page 18 2 Make sure the throttle is in the idle position 3 Connect the EZ Start controller according to the instructions on page 31 4 Press the starter button and watch for fuel moving through the fuel line up to the carburetor Watch closely The fuel moves very fast If the fuel doesn t move through the line within 5 seconds prime the engine by briefly one or two seconds covering the exhaust outlet until the fuel is just visible in the carburetor fuel line Watch carefully If the
48. lockwise to lower 4 Once the access hole is visible hold the spur gear and use your finger to turn the primary gear the shift point earlier shifts Be careful not to loosen the adjustment screw too much or you may cause the screw and spring to fall out requiring major disassembly and repair 8 Use 1 8 turn increments to find the approximate shaft which extends from desired shift point the transmission housing 9 Check performance by running a test lap after each Turn it clockwise Note adjustment that you will see two set screws pass under the access hole As you slowly turn the primary gear shaft counterclockwise the first set screw that becomes visible holds the two speed mechanism on to the shaft Do not loosen this screw The second set screw is the adjustment screw 5 Insert the 2 0 hex wrench through the clutch drum and into the adjustment set screw 10 Use 1 16 turn increments to fine tune the shift point 11 Be sure to reinstall the access plug to prevent dirt from entering the transmission The following section addresses some very basic engine and radio questions you may have about your S Maxx Most questions arise from simple user errors or minor adjustments that are easy to correct If you can t find a solution for your S Maxx here then visit our Web site at www Traxxas com and click on the Customer Support menu There you will find a much more extensive and detailed online troubleshooting a
49. midity and barometric pressure at the time you finished fine tuning your carburetor Current weather conditions can be found online from national websites local TV news websites and Television This information will be considered your baseline setting You may need to adjust your carburetor needles to compensate for changes in temperature and barometric pressure air density from day to day Generally you ll need to richen the fuel mixture when the weather is colder than your baseline temperature and the air density is higher Lean the fuel mixture when weather is warmer than your baseline temperature and the air density is lower The chart below provides general guidelines on how weather conditions affect air density when they move higher or lower than your baseline setting see page 28 for detailed info on how air density affects mixture settings Slightly richer Humidity Lower Slightly more dense Higher Slightly less dense Slightly leaner Pressure barometer Lower Less dense Leaner Higher More dense Richer Temperature Lower More dense Richer Higher Less dense Leaner Altitude Lower More dense Richer Higher Less dense Leaner Nitro Lower Leaner Higher Richer Tuning The Engine By Temperature The following procedures require an optional infrared temperature probe or on board temperature gauge Traxxas on board digital temperature gauge part 4090 Engine temperature can be used as an effective tuning aid when you unde
50. na when running your S Maxx Make a habit of holding the transmitter so that the antenna points straight up Antenna Tip Antenna Tube Spray alittle window cleaner on the antenna wire to make it easier to push through the antenna tube Don t shorten the length of the antenna wire Its length is tuned to the frequency band cutting it could severely shorten the radio system s range Don t push the transmitter antenna down from the top Pull it down from the bottom one segment at a time to prevent binding and kinking the antenna mast J In addition to the electronic throttle and steering trim controls your radio system features throttle neutral adjustment and servo reversing switches Throttle Neutral Adjustment The throttle neutral adjustment is located on the transmitter face and controls the forward brake travel of the throttle trigger Change the adjustment by pressing the button and sliding it to the desired position There are two settings available 50 50 Allows equal travel for both acceleration and braking 70 30 Allows more throttle travel 70 and less brake travel 30 50 50 is the required setting for the S Maxx with the TRX 2 5 Racing Engine Electronic Throttle Trim The electronic throttle trim located on the face of the transmitter adjusts the neutral center point of the throttle servo when the servo is at rest This control has been preset for you at the
51. nect the glow plug power wire and reinstall the air filter Denatured alcohol available from home centers and paint supply stores in a spray bottle is an extremely effective cleaner Be sure to wear safety glasses and gloves when working with denatured alcohol Fun fact WD 40 stands for water displacement attempt 40 The WD 40 product used today was the successful 40th attempt at creating a water displacing lubricant WD 40 was the lab test label Be sure to follow proper maintenance and storage procedures to avoid damage to your engine and other components of your S Maxx Don t put the fuel from your tank back into your fuel jug Dispose of it properly following city or county regulations Always wear eye protection when using compressed air or spray cleaners and lubricants ABC 23 After run maintenance 21 43 44 After run procedure 44 Air density 28 35 Air Filter 7 22 23 27 35 43 44 Cleaning 21 27 foam 23 maintenance 42 oil 6 Air Intake 22 Air temperature 36 42 Air fuel mixture 28 Air fuel ratio 28 29 32 Airflow 36 Ambient temperature 36 Antenna receiver 11 15 41 tip 15 tube 15 wire 15 Antenna transmitter 11 15 41 Antenna Mount 7 Atmospheric conditions 28 36 42 Axle pins 9 Barometric pressure 35 42 Baseline setting 35 Batteries 6 12 13 14 41 charging 30 receiver 13 14 rechargeable 13 14 transmitter
52. ngine is cooled by airflow created by speed Towing creates a high load on the engine and at the same time limits cooling of the engine due to low vehicle speed If your S Maxx gets stuck stop driving immediately Move the vehicle and then continue driving Driving Tips Monster trucks by design have a high center of gravity that requires a different driving technique To prevent rollovers slow down as you approach turns and then apply strong throttle through the turns This technique will help the S Maxx grab the surface and turn sharper gt Do not apply brakes and turn the wheel at the same time You could tip the truck over gt When jumping apply some throttle while the S Maxx is in the air to keep the truck s nose up and land level on all 4 wheels Be careful not to over rev the engine or land at full throttle Either could seriously damage your S Maxx If the nose of the truck is too high then quickly tap the brake to level the truck in the air Drive over large obstacles such as curbs and rocks at an angle instead of head on This will allow the suspension to articulate and absorb the impact much easier Factory toe in settings can be achieved by installing the rod ends on the turnbuckles until they bottom out against the shoulder If you desire more toe out the tips of the rod ends must be trimmed to allow them to screw down further onto the turnbuckle threads Once you become familiar with driving
53. nt works well Repeat twice 4 Thoroughly dry the parts with a clean towel or compressed air Remember to wear your safety glasses when working with compressed air 5 Oil the foam element by saturating it with foam filter oil Use the supplied Traxxas filter oil part 5263 or a high quality special purpose foam filter oil like what is used for high performance motorcycle and ATV engines This type of filter oil is available at motorcycle pro shops If foam filter oil is not available clean 30 40 weight motor oil can be substituted but is not preferred Never run the engine without a properly oiled filter Apply 30 drops of the Traxxas filter oil evenly to the top bottom and sides of the filter element 30 total drops divided among the 3 surfaces Squeeze the filter element repeatedly to help spread the oil throughout Squeeze the excess oil from the foam The filter element should be evenly colored by the oil Even color indicates that the oil is evenly distributed Note Do not use the air filter oil for anything other than the air filter It is not meant to be a lubricant 6 Reassemble the filter and install it on the engine making sure the rubber base fits securely on the carburetor with no gaps or air leaks Clean your air filter i after every hour of runtime to avoid engine damage even if the filter looks clean If you use compressed air to dry your air filter assembly wear safety glasses and avoid directing
54. o system and check its operation as described in the previous section Using Your Radio System pages 17 19 Have friend hold the model with the engine off Make sure your transmitter antenna is fully extended and then walk away from the model with the transmitter until you reach the farthest distance you plan to operate the model Operate the controls on the transmitter once again to be sure that the model responds correctly Do not attempt to operate the model if there is any problem with the radio system or any external interference with your radio signal at your location There s nothing like the TRX 2 5 Racing Engine in your new S Maxx The TRX 2 5 Racing Engine is vastly superior to typical R C engines and belongs in the category of specialty high performance racing engines It s the result of years of focused engineering development and thousands of hours of controlled testing and rigorous real world running It offers unprecedented power and performance that turns ready to run into Ready To Race The TRX 2 5 Racing Engine takes a total system approach Each part of the engine from the air filter to the exhaust tip is carefully engineered to work in harmony with other engine components Each part complements the next to extract maximum power The TRX 2 5 is designed to be tolerant of variations in tuning and to run successfully through a wide range of variable atmospheric conditions such as changes in t
55. onstant regardless of the load placed on the starter by the starter motor The Glow Plug LED light emitting diode on the control unit indicates the condition of the glow plug The Motor LED indicates the status of the EZ Start electric starter motor The cush drive mechanism in the drive unit prevents damage to the gears caused by engine kickback Smart Start protection circuitry prevents damage to the motor by cutting power if the load on the motor or other electronics exceeds safe limits according to the charger manufacturer s directions 1 Press the tab in the end of the battery compartment door to open 2 Plug a fully charged 7 2 volt NiCad battery pack into the connector inside 3 Twist the battery 2 or 3 times to twirl the battery plug wires This helps hold the wire and battery in place when the battery is placed in the compartment 4 Place the battery into the compartment and press the wires securely into place 5 Slide the battery compartment door back on and lock the end tab Using the EZ Start Your EZ Start controller plugs into a 4 prong receptacle in the center of the pickup bed on your S Maxx When the red button on the controller is depressed the EZ Start motor begins to spin the engine and power from the control unit heats the glow plug Assuming all settings and preparations are correct the engine should start almost immediately Each of the two status indicator LEDs on the h
56. ower shock mounting positions Wheel Force vs Wheel Travel 2 5 Lower Mount 1 Upper Mount 0 Lower Mount 2 Upper Mount 0 Lower Mount 1 Upper Mount A Lower Mount 4 2 Lower Mount 2 Upper Mount A l a Lower Mount 3 I Lower Mount 3 Upper Mount A Lower Mount 4 Upper Mount A More Firm 5 aN Lower Mount 2 Lower Mount 1 Upper Mount B 3 a Lower Mount 1 Lower Mount 2 Upper Mount B D 1 5 A Lower Mount 3 Upper Mount B 5 E Lower Mount 4 Upper Mount B Wheel Force Ib Less Firm 0 5 0 10 20 30 40 50 60 70 80 90 100 Wheel Travel mm Adjusting the Two Speed Transmission 6 Turn the adjustment screw 1 8 The S Maxx comes equipped with a two speed transmission turn clockwise to raise the shift When the shift point on the transmission is adjusted correctly it point later shifts Be careful not will maximize acceleration and improve drivability If necessary to over tighten the adjustment use the supplied 2 0mm hex wrench to adjust the shift point screw or you may damage the tension spring Do not make 1 Stop the engine constant adjustments or you will 2 Remove the large rubber plug from the transmission housing loosen the screw s locking 3 Look into the hole in the transmission housing and rotate device the spur gear until the access hole in the aluminum drum 7 Turn the adjustment screw 1 8 is visible turn counter c
57. rburetor body Thi screw adjusts the idle RPM of the engine Lean A running condition where the engine is not getting enough fuel for the available air Symptoms include engine overheating or the engine runs for a short time and then Stalls particularly at high speed This is a dangerous condition that should be corrected immediately or it can ruin your engine Leaning the mixture Turning either the high speed and or low speed needle s clockwise to decrease the amount of fuel the engine receives Low speed needle Needle valve that controls the low speed fuel mixture Needle valve Valve consisting of a tapered needle that closes against a corresponding seat to regulate fuel flow Nitro Abbreviation for nitro methane a component of model engine fuel that improves fuel combustion and power output Nitro also refers to a class of RC powered by model engines instead of electric Nitro content The amount of nitro methane used in the fuel Usually measured as a percentage of the total fuel volume Traxxas engines are optimized to use 10 20 nitro 30 nitro may be used for racing Nitromethane Nitro methane is a component in the fuel that increases power from the combustion process up to a point Engines are generally optimized to use a range of nitro content for the best power O ring Rubber O shaped ring used as a sealing gasket Pipe Abbreviation for the tuned exhaust pipe on a nitro engine See Tuned Pipe
58. rea In addition you may call Traxxas Customer Service at 1 888 TRAXXAS outside the US call 972 265 8000 Radio system does not work properly If the power light on the transmitter does not come on check for proper battery installation and that the batteries are new and or fully charged If the power light is blinking then the transmitter batteries are weak and should be replaced See page 13 for more details If the transmitter light is on but the radio is still not responding check for proper installation of the receiver batteries and that the batteries are new and or fully charged Check to make sure the on off switch on the model is in the on position Finally if there is still no response check the red and black wires that connect the battery pack to the batt terminal on the receiver you will have to remove the receiver cover Make sure the wires are not pinched or damaged and that the plug is secure in the receiver See page 14 for more details Short radio range If the radio range appears short then first check to make sure the transmitter antenna is fully extended and that the antenna in the S Maxx is in place and has not been cut or damaged Next make sure the batteries are all fully charged Finally if you are still experiencing short range try a different location Sometimes there can be interference from various sources that can cause your radio to malfunction Engine will not spin EZ Start will not turn the en
59. rket bolt on performance items Air Head Protector Filter Head Cylinder head EZ Start Drive Unit Fuel Intake Air Intake Carburetor Flywheel EZ Start Clutch Motor Bell Crankshaft Engine Throttle w Speed Mount Arm Crankcase Ground EZ Start EZ Start Glow Plug Plug Controller Wi ES Negative Wire Positive Wire Pressure Line Exhaust Fuel Line Tip Pipe Fuel Tank You ll find these Nitro R C engine terms throughout this section of the manual 15 15 or 15 refers to the size of the engine The TRX 2 5 is 15 cubic inches or 2 5 cubic centimeters cc The name TRX 2 5 is derived from the cc measurement ABC Abbreviation for aluminum brass and chrome Refers to engine construction that consists of an aluminum piston that slides in a chrome plated brass sleeve The TRX 2 5 uses ABC construction Air filter The air filter sits atop the carburetor and prevents harmful dust and dirt from entering the engine Dirt ingestion is the number one cause of premature engine failure so the engine should never be run without the air filter in place Big Block 15 A 15 2 5 engine that uses a larger crankcase size and longer stroke than typical 15 engines Generally only used for specific racing classes Break in Break in is the procedure for running a brand new engine according to specific instructions This correctly prepares the engine for normal running The
60. rstand the relationship between engine temperature and ambient temperature The engine operating temperature when tuned for maximum performance will vary according to atmospheric conditions The atmospheric condition that has the most influence on engine temperature is air temperature Expect the engine temperature to vary almost in direct proportion to atmospheric temperature Assuming you tuned the engine for the same maximum performance each day the engine will run about twenty degrees hotter when it s ninety degrees outside than it would in seventy degree weather For this reason we cannot give you a definitive temperature range that indicates the best possible engine tuning The temperature gauge can aid you in tuning by giving you a relative indication of how your adjustments are affecting the engine and by preventing you from exceeding maximum engine temperature For example as you lean the fuel mixture the engine performance will increase along with the temperature If you continue to lean the fuel mixture and the temperature increases but the engine performance does not change then you have exceeded the maximum safe lean setting Even if it s 100 F outside you should be able to tune for maximum performance Try to keep your engine from exceeding 270 F when measured at the glow plug If tuning for maximum performance results in engine temperature exceeding 270 F try to increase airflow to the engine by cutting out th
61. s very important to make several high speed runs with the S Maxx between adjustments to clear out any excess fuel Perform the pinch test immediately after If the engine is allowed to idle for along period of time it could load up with fuel and give you an inaccurate measurement from your pinch test For your convenience the low speed needle has a positive stop that prevents it from being over tightened and damaging the needle and seat This also provides an easy way to gauge how many turns out from closed the low speed needle adjustment is set to When tuning for performance watch closely to notice when there is no longer any increase in speed or power when the high speed mixture is lean If you lean the high speed mixture to the point that the engine cuts out hesitates or stalls you are well into the danger zone and engine damage is likely Richen the high speed needle 1 4 turn and retune 05 gt The engine s performance depends on the fuel mixture Turn the mixture needles clockwise to lean the fuel mixture and counterclockwise to richen it Leaning the fuel mixture will increase engine power up to the engine s mechanical limits Never run the engine too lean not enough fuel flow Never lean the engine until it begins to cut out or stall Leaning the engine beyond the safe allowable limits will result in poor performance and almost certain engine damage Indications of an overly lean mixture
62. switch on The red indicator light on the a Hs sa a S Maxx followed by the handheld transmitter transmitter should be solid red not flashing Turn on the receiver switch in the model The switch is located on the battery cover Position the S Maxx so that its front wheels are off the ground Turn the steering wheel on the transmitter back and forth and check for rapid operation of the steering servo Also check that the steering mechanism is not loose or binding If Natal the steering operates slowly check for weak receiver batteries When looking down at model the front wheels should be pointing straight ahead If the wheels are turned slightly to the left or right slowly adjust the steering trim control on the transmitter until they are pointing straight ahead S Maxx Servo Operation When the engine is running don t use the throttle trim on the transmitter to adjust the engine idle speed Instead use the idle speed adjustment on the carburetor Because your S Maxx features zero scrub radius suspension and wide tires the steering servo will not fully turn the front wheels when the vehicle is not moving Don t attempt to operate your S Maxx if there are any problems with your radio system or radio interference at your location Before each running session with your S Maxx you should range test your radio system to ensure that it operates properly 1 Turn on the radi
63. t 6 23 24 30 41 glow plug LED 30 31 41 motor LED 30 31 41 battery 30 41 controller 22 31 41 42 44 cush drive 30 drive unit 22 motor 7 22 31 41 plug 7 22 Protection Mode 31 41 Smart Start 30 31 Fit 23 Flag color 12 Flame out 24 Flooding see Engine flooding Flywheel 22 41 Frequency band 12 15 Fuel 5 6 24 26 42 44 break in fuel 32 fuel dispensing bottle 6 26 Traxxas Top Fueler 26 Traxxas Top Fuel 24 26 42 unburned 44 Fuel flow 28 Fuel intake 22 Fuel line fuel tubing 7 22 24 42 Fuel mixture adjustment 35 high speed fuel mixture 34 low speed mixture 35 Fuel mixture see also air fuel mixture 24 34 35 42 Fuel tank 7 22 26 44 emptying 44 filling 26 fuel level 32 tank lid 7 26 tank seal 26 Glow plug 24 30 31 32 34 41 42 driver 24 fouled 32 igniter 30 power wire 22 42 44 Ground wire 22 Half shaft 7 Head cylinder head 22 23 Head Protector 22 Header 7 24 Hex hubs 9 Humidity 35 Idle adjustment screw 35 Idle speed 17 24 29 32 33 34 35 Idle Speed Adjustment 29 33 35 Idle Speed Screw 22 24 29 Jumping 37 Lean 24 29 leaning the mixture 24 maximum safe lean setting 34 35 36 Lubrication 29 Maintenance 43 Maintenance schedule 21 Methanol 44 Mixture needles 34 high speed needle 22 24 28 35 42 low speed needle 22 24 28 35 Moisture 43 44 Needle seat 28 Needle settings 42 Needle valve
64. the maximum possible suspension travel and ride height Racing on a prepared track or on road use requires a lower ride height and firmer more progressive suspension settings The more progressive suspension settings help reduce body roll increased roll stiffness dive during braking and squat during acceleration Upper shock mounting position A should generally be used with lower shock mounting positions 1 and 2 Upper shock mounting position B should be generally be used with lower shock mounting positions 3 and 4 The innermost upper shock mounting position 0 can be used for tuning with the inner pair of lower shock mounting positions on the arm 1 2 It is not compatible with lower shock mounting positions 3 and 4 Other combinations may be used to achieve individualized suspension settings Lower Shock Mounting Positions In the out of the box configuration the shocks are installed in position A on the shock tower and position 3 on the lower suspension arm This setting allows for firm suspension and low ride height increasing the spring force at the wheel This setting improves high speed cornering on smoother terrain by lowering the center of gravity Body roll brake dive and squat are also reduced The inner pair of holes on the lower suspension arm should be used to increase the ride height of the S Maxx The more vertical position of the shocks will allow for lower shock progression and the soft plush fe
65. ting The symptoms described above can occur when the air density is very low such as in high mountainous elevations and extremely cold temperatures Under these conditions lean the fuel mixture slightly 1 8 turn to see if there is any improvement in starting and idling Only lean the fuel mixture just until the engine will run and idle reliably and then proceed with the break in The contents of different brands of fuel other than Traxxas Top Fuel in combination with extreme atmospheric conditions can also make the factory preset break in settings too rich and cause the symptoms described above Again try leaning the fuel mixture slightly 1 8 turn to see if there is any improvement in starting and idling Engine spins but will not start If the engine is spinning but will not start first check to make sure that both the motor and glow plug LEDs on the EZ Start controller light when the button is depressed If the glow plug LED does not light make sure the blue glow plug wire is tightly connected and is not damaged in any way If the wire is good then replace the glow plug It is normal for glow plugs to require periodic replacement Only use Traxxas heavy duty long glow plugs part 3231 Check to make sure the fuel is getting to the carburetor Remove the fuel line where it connects to the carburetor to see if there is fuel in it If not you may need to prime the engine Reconnect the fuel line and then refer to page 32 for ins
66. tructions on priming the engine Check your fuel mixture settings It may be necessary to adjust the fuel mixture if the outside temperature or barometric pressure has changed significantly since the last time the engine was run see Fine Tuning the Carburetor on page 36 Turn the high speed needle out rich counterclockwise 1 4 turn hold the throttle trigger at about 1 2 throttle and try again to start the engine Once started retune the engine for performance see page 35 The engine could be worn If the fit between the piston and sleeve is loose compression is reduced and the engine will be difficult to start when it is warm and may tend to stall when running and when the throttle is closed suddenly to idle Engine life depends on many factors including fuel type air filter maintenance needle settings and how the engine was used For example if the engine was allowed to ingest dirt from lack of air filter maintenance or running through water then the internal engine components could wear out extremely fast Engine performance sluggish Engine performance depends mostly on the fuel mixture settings and how they compensate for the current atmospheric conditions Before you suspect other failures with the engine richen the high speed needle at least 1 4 turn and then retune the engine for performance see page 35 If the fuel mixture seems to be set correctly make sure the fuel is fresh If the fuel is old or was left uncappe
67. ttery The EZ Start system requires a fully charged 7 2 volt NiCad battery pack not included Use a charger not included designed for 7 2 volt battery packs Charge the battery Use the Right Charger The most convenient type of charger is an AC peak The Traxxas EZ Start brings the convenience of push button electric engine starting to your S Maxx The EZ Start consists of a handheld control unit and an on board motorized starter detecting charger that plugs directly into an AC wall outlet It contains special peak detection circuitry that automatically shuts the charger off when the battery is fully charged If you re using a 15 minute timed charger always fully discharge the battery pack before each charge Some high mAh battery packs 1500 mAh or higher require more than the standard 15 minutes of charge time If the battery pack is cold after 15 minutes of charging add another 5 minutes of charge time Closely monitor the battery pack and stop charging it when it begins to feel warm to the touch Never leave a battery charging unattended Always follow charger manufacturer s instructions Power for the EZ Start system comes from a 7 2 volt rechargeable NiCad battery pack installed in the handheld control unit battery not included The engine glow plug is heated automatically by the EZ Start system eliminating the need to keep up with a separate glow plug igniter The voltage to the glow plug is kept c
68. ttle Brake Servo Turnbuckle Suspension Arm upper Bumper Front Shock Tower Skid Plate front Cross brace Bulkhead Shock Oil Damper The Quick Start CeTVi O LE Ee to replace the full operating instructions available in this manual Please read this entire manual for complete instructions on the proper use and maintenance of your S Maxx n5 The following guide is an overview of the procedures for getting your S Maxx running from opening the box to breaking in and tuning your engine Refer to the pages indicated for details on each step Look for the Quick Start logo on the bottom corners of Quick Start pages 1 Charge the battery pack See sidebar page 30 The EZ Start requires a fully charged 7 2 volt battery pack not included 2 Get the right fuel See page 26 Use Traxxas Top Fuel or consult with Traxxas before using other fuels 3 Glue the tires See page 9 Glue the tires to the rims to prevent the rims from spinning inside the tires 4 Install the antenna See page 15 Install the antenna mast in the S Maxx 5 Decal and Install the body See page 10 You will need to use the body during the break in process so it s best to decal it before you use it on the truck 6 Install batteries in the transmitter See page 13 The S Maxx requires 8 AA alkaline or rechargeable batteries for the transmitter 7 Install batteries in the model See page 14 The S Ma
69. until the engine is fully broken in before attempting sustained high speed running Patience and careful attention during break in will reward you with the best performing TRX 2 5 possible During break in your engine may appear to malfunction with symptoms like stalling inconsistent performance and fouled glow plugs These are simply the normal break in pains engines sometimes go through They will disappear once your engine is fully broken in Many owners report not experiencing any of these symptoms with the TRX 2 5 We recommend replacing the glow plug with a new one after the engine break in procedure Engine Break in Procedure The focus during break in is to vary and limit the engine speed This will be accomplished by accelerating and stopping at different rates for the first 5 tanks of fuel As the engine begins to break in the duration and intensity of the acceleration will gradually increase Sustained high speed running is not permitted until the 6th tank of fuel Perform the initial break in on a large flat paved surface Apply all throttle and braking actions gently Abrupt acceleration or braking could cause the engine to stall unnecessarily Special break in fuels are not recommended Use the same fuel you plan to use everyday If possible avoid breaking in the engine on extremely hot or cold days Pay careful attention to the fuel level Do not allow the fuel tank to run completely empty An extremely low fuel
70. ution Discontinue running your S Maxx at the first sign of weak batteries If the power indicator light flashes then the transmitter batteries are weak discharged or possibly installed incorrectly Replace with new or freshly charged batteries The power indicator light does not indicate the charge level of the receiver batteries in the model flashing red light to avoid losing control 1 Remove the battery compartment door by pressing the tab and lifting the door up If the power indicator 2 Install the batteries in the correct orientation as indicated doesn t light red check the polarity of the Peale bale compartiment batteries Check rechargeable batteries for a full charge 3 Reinstall the battery door and snap it closed j Direct the battery wires through the slot in the battery cover If the wires are not properly routed they may become broken or shorted causing radio system failure and loss of control If you use rechargeable batteries in your receiver be aware that when they begin to lose their charge they lose power much more quickly than regular alkaline batteries Signs of weak receiver batteries include sluggish steering response and shortened radio range Caution Discontinue running your S Maxx at the first sign of weak batteries to avoid losing control Ifthe radio system doesn t appear to work when the transmitter and receiver switches are turned on check for corre
71. www Traxxas com You may also e mail customer support with your question at support Traxxas com Join hundreds of Traxxas R C enthusiasts in our online community at Traxxas com Traxxas offers a full service on site repair facility to handle any of your Traxxas service needs Maintenance and replacement parts may be purchased directly from Traxxas or you can save shipping and handling costs by purchasing them from your local hobby dealer All of us at Traxxas want you to safely enjoy your new S Maxx Operate your S Maxx sensibly and with care and it will be exciting safe and fun for you and those around you Failure to operate your S Maxx in a safe and responsible manner may result in property damage and serious injury The precautions outlined in this manual should be strictly followed to help ensure safe operation You alone must see that the instructions are followed and the precautions are adhered to R C fuel is dangerous and highly poisonous Always follow all directions and precautions printed on the fuel container R C fuel especially when in a fuel dispensing bottle may look like a cool drink to a child Keep all fuel out of the reach of children at all times Do not place fuel containers on the ground where children can get to them while you are driving R C fuel is flammable Never allow smoking sparks heat or flame in the presence of fuel or fuel vapors The engine and exhaust system may become extremely hot during us
72. xx requires 4 AA alkaline or rechargeable batteries for the receiver 8 Install the EZ Start battery See page 30 Install and connect the 7 2 volt battery pack in the EZ Start controller 10 11 12 13 14 15 16 17 18 Turn on the radio system See page 18 Make a habit of turning the transmitter on first and off last Check servo operation See page 19 Make sure the throttle and steering servos are working correctly Range test the radio system See page 20 Follow this procedure to make sure your radio system works properly at a distance and that there is no interference from outside sources Fill the fuel tank See page 26 Use your fuel dispensing bottle to fill the tank Connect the EZ Start to the model See page 31 Learn the proper way to use the EZ Start electric starting system Start the engine See page 32 Learn to use the correct starting procedure for your TRX 2 5 Break in your engine See page 32 Follow the break in instructions exactly to ensure the best performing longest lasting engine Tune your engine See page 34 Learn how to set the fuel mixture needles for optimum engine performance Drive your S Maxx See page 37 Driving tips and adjustments for your S Maxx Maintaining your S Maxx See page 44 Follow these critical steps to maintain the performance of your S Maxx and keep it in excellent running condition The tires on your S Maxx must be glued
73. your S Maxx you might need to make adjustments for better driving performance Adjusting the Slipper Clutch The S Maxx features an adjustable slipper clutch on the spur gear to help protect the drive train from sudden shock loads such as landing off of jumps with the engine at full throttle Under normal conditions the slipper clutch should not slip Before adjusting the slipper clutch turn the model off Do not adjust the slipper clutch while the engine is running Use the supplied glow plug universal wrench to tighten the slipper nut clockwise until it stops and then back the nut out 1 4 of a turn If you notice any decrease in performance after making changes to the slipper clutch adjustment then it may be too loose The slipper must not be allowed to slip during normal acceleration or the slipper could be damaged Adjusting the Toe in Your S Maxx comes from the factory with zero degrees of toe in in the front and one degree of toe in in the rear You can adjust the toe in on the front and rear of the truck Set the steering trim on your transmitter to neutral Now adjust your steering turnbuckles so that both front wheels are pointing straight ahead and are parallel to each other 0 degrees toe in This will ensure the same amount of steering in both directions Adjust the rear toe control links so that the rear wheels have 1 of toe in Adjusting the Camber Two pivot balls are accessible through

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