INSTRUCTIONS - Harley
Contents
1. Screamin Eagle Holley Carburetor Tuning Information Initial Jetting Suggestions Cam No Yes No Yes No Yes Engine Mufflers 1340 EVO SE Slip Fit SE Slip Fit SE Slip Fit J01839 Transfer Feeds Main Jets 22 22 24 22 22 24 22 24 22 24 10 of 11 Part No 28009 00 and others Date 8 01 C N e Service Parts SE Performance Induction System i03094 ITEM DESCRIPTION PART NO DESCRIPTION PART NO Fuel Inlet Lock Screw Gasket 29708 00 Pump Discharge Nozzle 016 stock 29728 00 Fuel Inlet Adjustment Nut Gasket 29690 00 Pump Discharge Nozzle Gasket Fuel Inlet Needle and Seat Assembly 29709 00 outer 29686 00 Drain Plug Gasket 29689 00 Metering Block Gasket 29685 00 Accelerator Pump Diaphragm 29712 00 O ring 2 29688 00 Fuel Bowl Screw Gasket 4 29683 00 Main Jet 2 60 stock 29732 00 Accelerator Pump Check Valve 29710 00 Fuel Bowl Gasket 29684 00B Cotter Pin 29682 00 Transfer Feed 2 22 stock 29721 00 E ring 2 29729 00 Needle Valve Accelerator Pump Discharge Nozzle Gasket Pump Discharge 29779 01 inner 29687 00 S OONODOORWD J01839 11 of 112. The Main Circuit is used to deliver a mixture of fuel and air to the engine during high rpm usage Fuel for the main circuit is drawn through the main metering jets See Figure 4 and dis charged through the booster venturi s Whether the main cir cuit is rich or lean will result in a loss of power The main cir cuit is best tested at the track or on a dynamometer but can be calibrated by feel while driving the bike A main circuit that is too rich or too lean will make the motorcycle feel lazy Let plug readings tell you if it is too rich or too lean J01839 Idle Circuit MLE SPEED BET SAB NEEDLE ANO SEAT amp Gua TIME HUT idie Fae Restrictions Transfer or Slow Speed Circuit Transfer Feed Restrictions Main or High Speed Circuit Idle Well Tubes Choke Fugl Pick up Tube Main Metering Jet Tubes Figure 3 Metering Block and Fuel Bowl Metering Jets 2 of 11 Installation NOTE Refer to applicable Service Manual for detailed instructions on how to remove necessary components in order to access the carburetor Service Manuals are available from your Harley Davidson Dealer To protect against shock and accidental start up of vehi cle disconnect the negative battery cable before pro ceeding Inadequate safety precautions could result in death or serious injury Awarnine Always disconnect the negative battery cable first If the positive cable should contact ground with the negative ca
3. Air Fuel ratio AFR sensors target an AFR of 13 0 1 at idle If the engine runs well at either 1 2 or 3 turns extreme change to one step leaner smaller or one step richer larg er Transfer Feed Restrictions TF s Then reset the IMS away from the extreme positions Transfer Feeds TF Refer to Figure 22 The transfer feeds TF are the slow speed jets located on the bottom surface of the carburetor main body above the metering block They are the two inner feeds The Transfer Feeds affect off idle and cruise operation up to approximately 70 mph Start with the 022 TF s installed into the as received carbu retor If the engine exhibits leanness spitting sluggish at off idle transients or at cruising speeds the TF s will need to be increased in size Sizes from 024 026 and 028 are included in the Tuners Kit Part Number 29681 00 Increases in transfer feed restriction size may allow for a smaller main jet and vice versa During development of this carburetor no larger TF s than 024 were found to be required with engines ranging from stock EVO s to 1550 Twin Cam engines equipped with Screamin Eagle cams and heads Your engine may vary If no change is noted in the operation of the engine after changing to larger Feeds there may be restrictions in the cir cuits To check for any restriction in these circuits disassem ble the carburetor to remove the metering block Located on the bottom
4. atomized fuel to the engine NOTE Harley Davidson doesn t recommend changing these bleeds and so doesn t include any with the Tuners Kit If you have a need to adjust the sizes of these bleeds you will need to obtain additional sizes from a Holley distributor NOTE All development testing at Harley Davidson was performed using Harley Davidson Screamin Eagle parts We have no experience with combinations involving aftermarket suppli er s parts The results with using other supplier s parts may change the suggestions in the Table shown below NOTE Jetting with identical engine configurations on different bike platforms touring versus shorty dual exhaust systems was similar when using Screamin Eagle touring and shorty dual mufflers Air Cleaner Maintenance 1 Remove the air cleaner cover and inspect the element every 5000 miles or more often under dusty conditions 2 To clean the element remove and wash by rolling it on edge in a shallow pan containing enough Air Cleaner Degreaser P N 99883 88T to cover no more than 3 4 depth of filter pleats Do not let solution get inside element 3 Remove the element from the Cleaner Degreaser and allow five minutes to dissolve dirt From the inside out rinse element with cold water shake and let air dry Do not dry with compressed air 4 Re oil element Apply along full length of each pleat and allow to set until all is uniform color Allow excess to drain and reinstall
5. surface of the metering plate are five brass tubes that extend into the float bowl See Figure 23 The two larger center tubes hold the main jets while the smaller back ones are the idle transfer feed tubes The fifth smaller tube in between the main jet tubes is for the choke fuel pick up Using a spray carburetor cleaner and high pressure air flush these tubes out in the direction of fuel flow from the end of the brass tube toward the body of the metering block NOTE Don t attempt to flush these circuits in a reverse direction from metering block toward brass tubes You can force any debris that may be present in these passages into the small restrictions at the float bowl end of the tubes To assist in seeing any small debris that may be present in these circuits place the metering block on a clean white rag and flush the tubes out on to this rag It may also be necessary to use the spray cleaner and high pressure air to flush out each pas sage in the mainbody J01839 lle Well Tu bas Main Metering Jet Tubes Figure 23 Bottom Surface of Metering Plate Accelerator Pump Discharge Nozzle PD Nozzle The PD Nozzle is located in the lower front center of the car buretor air inlet Refer back to Figure 1 There are two discharge holes located on the backside ori ented so they hit the sides of the booster venturis With engine off rotate throttle to verify fuel is being discharged from both discharge holes If n
6. 4 1 6 8 Nm tor throttle must return to the closed idle position Perform Steps a through c to adjust the throttle cables CAUTION The throttle cable adjustment is necessary to prevent excess stress and potential failure to the throttle cables J01839 5 of 11 NOTE The throttle cable has a 5 16x18 inch threaded adjuster and is assembled to the right side of the throttle grip The idle cable has a 1 4x20 inch threaded adjuster and is assembled to the left side of the throttle grip a Turn the cable adjusters and locknuts clockwise as far as they will go Both cables should have zero adjustment to start this procedure b See Figure 15 Point the front wheel straight ahead Turn the throttle grip so throttle is wide open fully counter clockwise and hold it there Now turn the throttle cable adjuster 1 counter clockwise until the throttle cam stop just touches the stop boss on the carburetor Tighten the locknut 2 against the throt tle cable adjuster and release the throttle c Turn the front wheel full right Turn the idle cable adjuster counter clockwise until the idle cable hous ing just touches the spring in the cable support sleeve Work the throttle grip to make sure throttle cable returns to idle position when released If the cable does not return to idle turn the cable adjuster clockwise to achieve the correct adjustment Tighten the idle cable adjuster locknut against the idle cable adjuster Check adjustment b
7. P N 9946 Figure 16 Install Breather Hose to Backing Plate 32 See Figure 17 Cut the long end of the manifold breather hose to the correct length connect it to the manifold breather and secure with 3 8 hose clamp P N 9946 Figure 17 Install Breather Hose to Manifold 33 See Figure 18 Install the air filter TC P N 29679 99 or EVO P N 29675 00 to the backing plate and secure with three button head screws P N 4365 Tighten to 3 5 ft lbs 4 1 6 8 Nm 6 of 11 EA tk Figure 18 Install Air Filter 34 See Figure 19 Apply Loctite 243 blue to threads of cover screw removed from original air cleaner and install cover using screw and washer 35 Secure the enrichener cable to its bracket on the left side of the motorcycle J01839 Check Enrichener Adjustment NOTE Check enrichener operation The fuel enrichener knob should open remain open then close without binding The knurled plastic nut next to the enrichener knob controls the ease or difficulty with which the cable slides within the cable conduit If adjustment is needed perform Steps a through e as fol lows a Loosen hex nut at backside of mounting bracket b Move cable assembly free of slot in mounting brack et c Hold cable assembly at flats with adjustable wrench Turn knurled plastic nut counter clockwise by hand to reduce sliding resistance until knob slides inward unaided d Turn plastic nut clockwise to increase slidin
8. SMOTOR HARLEY DAVIDSON WY J01839 INSTRUCTIONS REV 8 31 01 Kit Numbers 27970 00 27937 00 28009 00 and 28011 00 SCREAMIN EAGLE PERFORMANCE INDUCTION SYSTEM General This kit is designed for use on 1999 and later Carbureted Twin Cam 88 and 1993 and later 1340 Evolution Model Motorcycles CAUTION Harley Davidson motorcycles equipped with some Screamin Eagle high performance engine parts may not be used on public roads and in some cases must be restricted to closed course competition This engine related performance part is intended for racing applica tions and is not legal for sale or use in California on pol lution controlled motor vehicles Engine related perfor mance parts are intended FOR THE EXPERIENCED RIDER ONLY NOTE S E Holley Carburetor Rebuild Kit P N 29680 00 and Carburetor Performance Tuning Kit P N 29681 00B are also available from your authorized Harley Davidson Dealer Kit Contents This kit consists of the following parts Some parts are unique to EVO applications Kit Numbers 27970 00 and 28009 00 and some are unique to Twin Cam applications Kit Numbers 27973 00 and 28011 00 For detailed carbure tor internal parts listing see Service Parts Illustration on Page x Qty Description Part Number 3 Bolts carb to manifold 5 16x1 1 4 inch 29711 00 1 Valve enrichener 29723 00 1 Guide enrichener cable 29724 00 1 Bracket throttle cable 29725 00 1 Screw throttle cable br
9. The Float Level is set at the factory and should not need adjustment In the event that adjustment becomes necessary use the following procedure CAUTION When removing the fuel bowl from the carburetor be careful not to drop the accelerator pump check needle from the accelerator pump fuel passage a Remove the fuel bowl from the carburetor b See Figure 20 Press against the float tab until the float is in its full UP position Measure from the outer end or toe of the float to the top edge of the fuel bowl This measurement should be 475 inch To adjust loosen the needle and seat lock screw and turn the adjusting nut clockwise to lower the level and counter clockwise to raise the level Retighten the lock screw Note the following Too high of a float level can be identified by a loss of idle quality when the bike is set on its kick stand Too low of a float level can be identified by a lean condition that can only be calibrated out by using excessively large transfer feed restrictions and main jets Figure 20 Float Adjustment J01839 c See Figure 21 Make sure to reinstall the pump check needle into the pump passage of the fuel bowl before the bowl is installed The pointed end of the needle goes in the passage first Reinstall the fuel bowl Pump Passage Accelerator Pump Check Needle Figure 21 Float Bowl Idle Mixture Screws IMS and Idle Feed Restrictions See Figure 22 There are tw
10. acket 29726 00 2 Jet main size 58 29731 00 2 Jet main size 62 29733 00 1 Cable choke 29719 00 1 Fuel hose 63631 00 2 Seal intake manifold 26995 86B 1 Flange intake front 27009 86A 1 Flange intake rear 27010 86A 1 Intake manifold Evolution 29003 00 1 Intake manifold Twin Cam 29677 00 1 Gasket carburetor to manifold 27972 00 1 Carburetor satin 27971 00 1 Carburetor polished 28010 00 1 Hose breather 63534 90 3 Stud 29447 99 1 Back plate air cleaner 29129 00 1 Filter element Evo kit only 29675 00 1 Filter element Twin Cam Kit only 29679 00 1 Gasket back plate to manifold 29676 00 1 Breather manifold 27900 97 Kit Contents cont Qty Description Part Number 4 Clamp worm drive 3 8 inch 9946 3 Screw button head 1 4 20x1 2 inch 4365 2 Screw flat head 1 4 20x5 8 inch 3793A 2 Seal manifold 26995 86B 1 Nipple 90 degree 63707 00 2 Washer 46465 99 Washer 6 w Evo kit 4 w TC kit 45596 93 2 Banjo bolt Evo kit only 45571 97A 2 Banjo bolt Twin Cam kit only 45507 99 1 Bracket mounting 29133 00 1 Insert air cleaner Evo only 29448 99 1 Insert air cleaner Twin Cam only 29450 99 Screamin Eagle Holley Carb Overview The Screamin Eagle Holley Carburetor is a two barrel carbu retor for your Evolution or Twin Cam powered Harley Davidson It can be calibrated for all engine configurations The charts and tuning instructions in this Instruction Sheet will aid in the calibration process The carbur
11. asher and hex nut just removed from the existing assembly Install the rubber boot over the straight steel cable guide P N 29724 00 Install the original plastic nut and spring along with the new enrich ener valve P N 29723 00 10 Install the enrichener cable assembly to the back of the new carburetor Disassembled Enrichener Cable fi New Enrichener Valve New Cable Guide Assembled Enrichener Cable Figure 5 Assemble Enrichener Cable 11 See Figure 6 Obtain manifold gasket P N 27972 00 and position between manifold and gasket as shown Figure 6 Position Manifold Gasket 3 of 11 12 See Figure 7 Use the three 1 1 4X5 16 inch bolts P N 29711 00 from kit and while holding gasket in place install the carburetor to the new intake manifold Figure 7 Install Carburetor 13 Place one large ID washer P N 45596 93 over each banjo bolt TC P N 45507 99 EVO P N 45571 97A Insert the bolts through the holes in the mounting brack et P N 29133 00 then place a second large ID washer over each banjo bolt Place the breather manifold P N 27900 97 over the banjo bolts with the hose fitting on the manifold toward the rear of the bike Place the remaining two washers TC P N 46465 99 EVO P N 45596 93 over the breather bolts NOTE On Twin Cam engines the last washers will have small ID 14 See Figure 8 While holding the assembly together insert the banjo bolts into the tapped holes in the cylin der
12. ble installed the resulting sparks may cause a battery explosion which could result in death or serious injury 1 Disconnect negative battery cable 2 Following instructions in applicable Service Manual remove stock air cleaner carburetor and intake mani fold w See Figure 4 Remove the stock enrichener cable assembly from the original carburetor Figure 4 Stock Enrichener Cable Assembly 4 If the stock intake manifold has a MAP sensor installed remove it and install it into the intake manifold supplied with the kit 5 Install new seals and flanges to intake manifold NOTE Make sure the manifold flanges are installed correctly The flanges are designated F for the front and R for the rear cylinder 6 Connect the vacuum hose to the fitting on the manifold and the electrical connector to the MAP sensor if pre sent NOTE If your fuel petcock has been changed and no longer uses the vacuum line from the original petcock to the intake mani fold the port on the top of the new manifold needs to be capped and the vacuum line needs to be plugged 7 Install the manifold to the cylinder heads and finger tight en only at this time J01839 8 See Figure 5 Disassemble the stock enrichener cable assembly Remove the enrichener valve spring plastic nut 90 degree elbow hex nut and star washer from the cable 9 Obtain the new enrichener cable P N 29719 00 from kit and install the star w
13. etor has three main components The Fuel Bowl The Metering Block The Mainbody See Figure 1 The fuel bowl is a fuel reservoir to provide fuel to the different circuits of the carburetor The metering block is a mixing and delivery service The mainbody is the inlet for air and the outlet for fuel and air BOOSTER WOXTUEFS RAIN BODY PUMP COVER Ou ache EETEHTIOH AFM Figure 1 Three Main Components of Carburetor 1 of 11 Within the three components are five systems The Float System The Accelerator Pump System The Idle Circuit The Transfer or Slow Speed Circuit The Main or High Speed Circuit Float System The Float System located in the fuel bowl is critical for all cir cuits of the carburetor It regulates the amount of fuel in the fuel bowl that will be available to the different circuits of the carburetor If set to low all circuits will run lean If set too high all circuits will run rich Accelerator Pump System The Accelerator Pump System provides the carburetor with extra fuel to aid in acceleration letting the carburetor smooth ly transition from idle to off idle to the main circuit when the bike is accelerated The amount of fuel fed by the accelerator pump system is controlled by the size of the discharge holes in the accelerator pump discharge nozzle The accelerator pump discharge nozzle is located in the mainbody Refer to Figure 1 A pump circuit with too small of an accelerator pump discharge no
14. g block Refer to Figure 23 1 Start with the suggested jetting listed in the chart Figure 25 and change as required Sizes ranging from 56 up to 70 main jets are included in the Tuners Kit Larger sizes are available from a Holley distributor NOTE The best way to adjust the main jets is either on the race track or using a chassis dynomometer but they can be cali brated by feel while driving the bike A main system that is too rich or too lean will make the motorcycle feel lazy Let plug readings tell you if the engine is running too rich or too lean 2 Start with the jet sizes suggested in the chart then increase jet sizes until the fastest bike speed is obtained on the track or maximum power is acheived on the dyno If you have access to oxygen sensors to measure the exhaust s AFR target an AFR of 12 0 to 12 5 1 at the higher engine speeds This should be the average of the front and rear cylinders 3 A set of 58 MMJ leaner jets are included in the kit for engines that exhibit a rich condition and a set of 62 MMJ richer jets for engines that exhibit lean conditions Air Bleeds There are four air bleeds located in the lower front of the car buretor air inlet The outer ones are for the idle and transfer circuits and are called the Idle Air Bleeds IAB The inner ones are for the main circuit and are called High Speed Bleeds HSB These air bleeds work in conjunction with their respective fuel feeds to feed
15. g resis tance until knob remains fully out without holding and closes with relative ease e Position cable assembly in slot in bracket Tighten hex nut at backside of bracket CAUTION Do not lubricate the cable or inside of conduit The cable must have sliding resistance to operate properly 36 Recheck throttle cable operation Always connect the positive battery cable first If the posi tive cable should contact ground with the negative cable installed the resulting sparks may cause a battery explo sion resulting in death or serious injury 37 Connect the battery cables positive cable first 38 Start the motorcycle per procedure outlined in your Owners Manual or applicable Service Manual Once engine is warm set idle speed set screw according to Manual specifications usually 1000 RPM NOTE If original petcock is still being used it may take several sec onds for enough fuel to enter the fuel bowl to start the motor cycle 39 Drive the motorcycle and check engine performance If engine performance is unsatisfactory tune the carbure tor following instructions under Carburetor Tuning Procedures in these instructions 7 of 11 Carburetor Tuning Procedures General Jetting Nomenclature Fuel Restrictors are called Feeds Air Restrictors are called Bleeds NOTE Additional main metering jets and transfer feed restrictions for tuning are included in the TUNERS KIT P N 29681 00 Float System
16. heads Tighten each bolt a little at a time until the assembly is loosely held in place Bracket pay O a i 4 i lt F Si n i st k Figure 8 Install Mounting Bracket Assembly 15 See Figure 9 Obtain the 90 degree nipple hose fitting P N 63707 00 and screw into the backside of the back ing plate P N 29129 00 Do NOT overtighten The hose fitting should be pointing toward the back of the motorcy cle after installation J01839 16 17 18 19 90 degree Fitting Figure 9 Install Hose Fitting to Backplate See Figure 10 Install the backing plate gasket P N 29676 00 and backing plate to the front of the carbure tor using three studs P N 26447 99 Align the backing plate to the bracket by installing the two 1 4 20x5 8 flat head screws P N 3793A to the mounting bracket Do NOT tighten Finger tighten the banjo bolts installed into heads to align the carburetor backplate and intake manifold Making sure everything is aligned tighten the rear cylin der intake manifold bolts on left sparkplug side of engine to secure the manifold in position Remove the backing plate mounting bracket manifold breather tube and carburetor assembly then tighten the front cylinder intake manifold bolts on right pushrod side of engine Figure 10 Install Backing Plate 4 of 11 20 See Figure 11 Route and connect the throttle cables to the carburetor throttle wheel Refer to the ap
17. o brass feed restrictions located on the bottom surface of the carburetor main body above the metering block The idle feed restrictions are the two outer feeds located on this surface IMPORTANT It is not recommended to change these idle feed restric tions from the 022 that are installed in the as received carburetor since IMS setting will have the same effect The IMS are located in the left and right sides of the metering block and are fuel flow adjusters for idle and part throttle load ranges Turning the IMS IN clockwise leans the car buretor and turning it OUT counterclockwise enriches the carburetor NOTE The normal range for the IMS is 1 2 to 3 turns OUT idle Feed Restrictions Transfer Feed Restrictions Figure 22 Metering Block 8 of 11 With the as received carburetor the IMS setting should be set to approximately 1 turn out If the engine exhibits a rich or lean condition at idle or up to 3 8 throttle opening adjusting the Idle Mixture Screw IMS may correct the condition with out having to change transfer feed restrictions If required adjust the two screws in or out to obtain a steady idle speed Idle speed should be reset to approximately 1000 rpm after each adjustment Slight hesitations right off idle usually can be attributed to IMS setting that is too lean even if the engine is idling smoothly Turning each IMS out 1 8th to turn should correct this If you have access to
18. ot remove nozzle and blow compressed air through each hole 1 Start with the 016 inch PD nozzle installed in the as received carburetor If you experience slow throttle response during acceleration or a hesitation that cannot be removed by IMS adjustment or there is a dip in the torque curve at low rpm s when running on a dynamometer increase to the larger 018 PD Nozzle included in the Tuners Kit 2 Check the pump rod adjustment A improperly adjusted pump rod can cause off idle hesitations See Figure 24 To adjust the pump rod perform the fol lowing a Remove the cotter pin from the pump rod and remove the pump rod from the pump cover exten sion arm b With the pump rod in the full upward position and the pump cover extension arm in the full down ward position without compressing the pump diaphragm half of the rod end should be visible in the lower half of the pump cover extension arm hole c If more or less of the pump rod is visible loosen the jam nut and turn adjusting barrel to lengthen or shorten the rod Retighten the jam nut and turn adjusting barrel to lengthen or shorten the rod Retighten the jam nut reinstall the pump rod in the pump cover extension armhole and reinstall the cotter pin 9 of 11 Adjusting _ Barrel Figure 24 Accelerator Pump Rod Adjustment Main Jets The main jets are located at the bottom of the large brass tubes which are located on the bottom surface of the meter in
19. plicable Service Manual and ensure that the throttle cables are of the correct length and are rout ed correctly If the cables are not of the correct length or routed correctly they could interfere with the operation of the motorcycle This could cause loss of control of vehicle which could result in death or serious injury Figure 13 Install Bracket to Carburetor 23 See Figure 14 Reinstall the intake manifold gasket and carburetor to the intake manifold using three 5 16x1 1 4 inch bolts P N 29711 00 Tighten to 10 12 ft lbs 13 6 16 3 Nm Figure 11 Connect Throttle Cables To Throttle Wheel 21 See Figure 12 Obtain the new throttle cable bracket P N 29725 00 and bracket screw P N 29726 00 and install the throttle cables into the bracket Figure 14 Reinstall Intake Manifold Gasket and Carburetor to Manifold Awarnine Refer to the applicable Service Manual and ensure that throttle cables are of the correct length and are routed correctly If the cables are not of the correct length or routed correctly they could interfere with the operation Figure 12 Install Throttle Cables to Bracket of the motorcycle This could cause loss of control of vehicle which could result in death or serious injury f 24 The throttle control must operate freely without binding 22 See Figure 13 Install bracket onto carburetor and torque With the friction adjusting screw backed off the carbure screw to 3 5 ft lbs
20. y turning forks to full left full right lock and straight ahead Throttle cable adjuster 3 Idle cable adjuste Locknut 4 Locknut 25 26 27 28 Figure 15 Throttle Cable Adjustment 1995 Switch Housings Shown Check carburetor for correct throttle opening and clos ing Correct any existing problems at this point before proceeding Obtain fuel hose P N 63631 00 from kit and install one end on the carburetor fuel bowl inlet Secure end with 3 8 hose clamp P N 9946 Route fuel hose through its original position using the original protective sleeves Attach the end to the fuel supply valve and secure using 3 8 hose clamp P N 9946 Apply a small amount of Loctite 243 blue to the banjo bolts and reinstall the manifold breather tube bracket and banjo bolt assembly to the cylinder heads J01839 29 Refer to Figure 6 Reinstall the carburetor to backing plate gasket and backing plate to carburetor and mount ing bracket using two flat head screws P N 3793A and three 1 4 20 studs P N 29447 99 Tighten all five fas teners 3 5 ft lbs 4 1 6 8 Nm 30 Tighten the manifold breather tube banjo bolts to 10 12 ft lbs 13 6 16 3 Nm NOTE It may be necessary to shorten the short end of your allen wrench to tighten the bolts 31 See Figure 16 Attach the short end of the manifold breather hose to the 90 degree fitting on the backside of the backing plate and secure with 3 8 hose clamp
21. zzle hole size will cause the bike to hesi tate and possibly backfire from the carburetor Too large of an accelerator pump discharge nozzle hole size and the bike will be lazy during acceleration with black smoke being emit ted from the tailpipe A correctly sized pump discharge noz zle will give crisp clean accelerations Idle Circuit The Idle Circuit is used to deliver a mixture of fuel and air to the engine during idle It will only work for a very short time off idle before stopping and letting the transfer circuit take over The fuel air mixture is adjusted by the idle mixture screws in the metering block and metered by the idle fee restrictions in the mainbody Figures 2 and 3 Setting s that are too rich give poor idle quality and black smoke out of the exhaust Settings that are too lean give poor idle quality with hesitations during accelerations Transfer Circuit Slow Speed The Transfer Circuit is used to deliver a mixture of fuel and air to the engine during off idle and cruise range Its fuel is metered by two restrictions in the mainbody that deliver fuel to the transfer slot located in the throttle bore of the main body See Figure 3 Calibrating too lean will result in poor dri vability in the cruise range with spitting out of the carburetor Calibrating too rich will result in poor drivability in the cruise range with popping out the exhaust and a possible engine miss at cruise speeds Main Circuit High Speed
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