INSTRUCTIONS - Harley
Contents
1. Service Parts 44mm Big Bore CV Carburetor Tuner Kit Description Part No Description Part No Main Jet 6 See Kit Breakdown Screw Top 3 27262 96 Needle jet 27725 99 Collar Carburetor top 27263 96 Needle jet holder 27101 88 Boot accelerator top 27311 76 Rod 27122 89 Spring 27315 88A Spring 27123 89A Screw 27317 88 E clip 27124 89 Bracket throttle cables 27339 90 Washer 27125 89 O ring 2 27360 76 Lever 27126 89 Diaphragm accelerator pump 27361 76 Washer 27127 89 Spring diaphragm 27362 76 Pin 2 27128 89 Clip overflow hose 27368 76 Idle screw 27130 90 Hose overflow w clip 27553 99 Spring 27136 90 Fitting L joint 27371 76 Washer 27137 81 Pin 27575 88A Screw w washer 27146 89 Float 27576 92 Collar 27147 89 O ring float chamber 1 27577 92 Washer 27148 89 Screw 4 27579 88A Rod 27156 89 Cable guide 27580 88 O ring 27127 89 Starter cap 27581 88 Drain screw 27158 89 Cable sealing cap 27582 88 Float chamber assembly 27287 98 Starter valve 27583 88 Pump housing 27260 00 Vacuum piston 27552 99 Spring 1 See Kit Breakdown Spring seat 27586 88 Slow jet 3 See Kit Breakdown Screw 27587 88 Jet needle 4 See Kit Breakdown 49 Valve w clip 27886 78A Top carburetor 27261 96 NOTE Items marked with an asterisk and in bold are included in Tuner Kit P N 27419 99 See below for more detail on component breakdown All other items are for illustration purposes only TUNER KIT PARTS BREAKDOWN Tuner Kit P N 27419 992. 1 4 throttle Changing the SLOW jet also affects the idle mixture adjustment so the idle will need to be reset if the SLOW jet is changed 1 4 to 3 4 Throttle Mixture The JET needle mainly affects the engine s mixture from approximately 1 4 to 3 4 throttle position 3 4 to WOT Wide Open Throttle Mixture The MAIN JET affects engine mixture above 3 4 throttle posi tion The most effective method to tune this area is to per form timed runs between two fixed points Begin by cruising at a steady speed of approximately 60 mph in high gear When you pass the 1st point open the throttle to WOT and have someone measure the time it takes to reach the 2nd point Change MAIN jets and repeat this process until the fastest time is obtained J01698 Vacuum Piston Spring The Big Bore 44mm CV carburetor comes equipped with a 200 290 gram P N 27162 89 vacuum piston coil spring 22 The Tuner Kit has lighter 130 210 gram spring P N 27728 99 included which will make the transition from off idle to WOT quicker 2 of 4 Kit No 27419 99 Date 7 00 SMOTORZ Q Service Parts 44mm Big Bore CV Carburetor Tuner Kit i01755 eps i01758 Intake manifold Idle Mixture Screw Inset Idle Mixture Screw Location from carburetor bottom NOTE See next page for index identification and description Service Parts have a Harley Davidson Part No listed J01698 sont Kit No 27419 99 Date 7 00 SMOTORZ Q
3. Detailed Listing Additional Jets not in kit Item Description Part Number 1 Main Jets 200 27105 88 210 27726 99 220 27775 99 MET mber 230 27776 99 Description Part Numbe 240 27778 99 Slow Jet 45 27170 89 250 27779 99 Main Jets 4 180 27114 88 185 27185 90 190 27243 95 195 27275 96Y NOTE For additional jets the following stock CV carb parts can be used and can be obtained from your Harley Davidson Dealer Spring 130 210 gm 27728 99 Slow Jets 3 48 27165 90 50 27724 99 52 27780 99 Spring 200 290 gm 27162 89 NOTE The jet needles for the stock carburetor are too short and cannot be used in the Big Bore 44mm carburetor Jet Needles Listed Lean to Rich N8EK 27727 99 N8EL 27933 99 N8EM 27967 99 N8EN 27968 99 J01698 AOS
4. MOTOR HARLEY DAVIDSON WUY J01698 INSTRUCTIONS REV 7 19 00 Kit Number 27419 99 SCREAMIN EAGLE 44 mm BIG BORE CV CARBURETOR TUNER KIT General This kit is designed for use with Screamin Eagle 44mm Big Bore CV Carburetor Kit P N 27934 99 This kit contains a selection of jets and needles to help tune the carburetor Kit Contents See Service Parts Illustration and list at the end of this sheet for kit contents NOTE Refer to applicable Service Manual for detailed instructions to remove necessary components Service Manuals are available from your Harley Davidson Dealer 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 Gasoline is extremely flammable and highly explosive Do not smoke or allow open flame or sparks anywhere in the area when servicing any part of the fuel system Failure to follow instructions could result in death or serious injury Carburetor Removal For removal procedures refer to the Fuel System section in a 1993 or later Service Manual for Carbureted Evolution or Twin Cam model moto
5. creases black smoke appears from the exhaust acceleration is sluggish and or the spark plugs are black and sooty the carburetor may need to be jet ted for a leaner running condition Idle and Off Idle Adjustment The Idle Mixture Screw is a fuel adjustment screw located on bottom of carb outlet side in a passageway See Inset on Page 3 Turning the Idle Mixture Screw in Clockwise will lean the idle mixture and turning it out Counterclockwise will richen it Adjusting the Idle Mixture Screw will adjust the idle and off idle operating mixture If the idle mixture requires adjustment start at the initial set ting point of 1 1 2 turns out and an idle speed of 1000 rpm Then adjust the screw 1 2 turn at a time in for leaner adjust ment out for a richer adjustment After each adjustment reset the idle speed back to 1000 rpm and check the engine for improvements to its running operation NOTE Do NOT turn the Idle Mixture Screw out more than 3 1 2 turns If good operation is achieved at 3 1 2 turns you may want to install one size larger SLOW jet then readjust the idle screw NOTE Do NOT tightly bottom out the Idle Mixture Screw or damage to the screw and its seat may result If good operation is achieved at 1 2 turns out you may want to install one size smaller jet then readjust the idle mixture screw 1 of 4 Off Idle to 1 4 Throttle Mixture The SLOW jet affects the engine s mixture from off idle to approximately
6. rcycles Carburetor Disassembly This Big Bore carburetor uses many of the same parts and rebuilding procedures as stock 1993 and later CV Carbureted models Refer to the Fuel System section of a 1993 or later Evolution or Twin Cam Service Manual for Big Bore carburetor disassembly procedures Carburetor Installation For installation procedures refer to the Fuel System section in a 1993 or later Service Manual for Carbureted Evolution or Twin Cam model motorcycles 44mm Carburetor Tuning Procedures The 44mm Big Bore CV Carburetor as shipped is calibrated for use on modified Harley Davidson Big Twin engines equipped with SCREAMIN EAGLE bolt in High Performance Cam Air Cleaner and Exhaust System NOTE All carburetor tuning should be performed with the engine warmed up to normal operating temperature NOTE Prior to performing any jetting changes ensure the carbure tor and manifold are installed correctly and there are no intake leaks Also make sure the float is adjusted correctly Refer to the Fuel System section in a 1993 or later Service Manual covering Carbureted Evolution or Twin Cam model motorcycles for float adjustment procedures Lean Conditions If you experience lean running conditions such as the engine spitting back through the carburetor and or hesitation upon acceleration the carburetor may need to be jetted for a richer running condition Rich Conditions If fuel economy drastically de
Download Pdf Manuals
Related Search