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| ===== Sub-Documents ===== | ===== Sub-Documents ===== | ||
| * . . . [[techtalk:ih:carb02a|Finding and fixing the cause of the degradation that leads to intake manifold leaks]] | * . . . [[techtalk:ih:carb02a|Finding and fixing the cause of the degradation that leads to intake manifold leaks]] | ||
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| ====== Tillotson HD Carburetor (1966-1971) ====== | ====== Tillotson HD Carburetor (1966-1971) ====== | ||
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| - Inspect the inlet needle lever for correct adjustment. It should be flush with the surrounding floor of the carb body. If not equipped with a shackled needle, replace with kit (27588-66). Torque seat to 45 in-lbs. | - Inspect the inlet needle lever for correct adjustment. It should be flush with the surrounding floor of the carb body. If not equipped with a shackled needle, replace with kit (27588-66). Torque seat to 45 in-lbs. | ||
| - Test the economizer ball check for leakage and correct operation. Using the hose end of tool (96960-68), place it over the economizer welch plug hole so that it seals off the surrounding area. With alternate pressure and vacuum applied by mouth, ball check should release and seal. Replace any defective parts. \\ | - Test the economizer ball check for leakage and correct operation. Using the hose end of tool (96960-68), place it over the economizer welch plug hole so that it seals off the surrounding area. With alternate pressure and vacuum applied by mouth, ball check should release and seal. Replace any defective parts. \\ | ||
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| - | ====== Keihin Carburetor - Butterfly or Non-CV (Late 1976-1987) ====== | ||
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| - | ===== Lean Condition Adjustments from the MoCo (1979) ===== | ||
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| - | * During the mid 1979 model season, HD makes a recommendation to dealers for corrective measures regarding the carburetion and [[techtalk:ih:engctl01#prestolite_electronic_ignition_system|ignition system]] on (1100, 1200 and 1340cc) models with emissions control design changes. They operate with leaner air/fuel mixtures and are more sensitive to carburetor mixture settings / ignition spark. ((HD Service Bulletin #M-739 dated November 3, 1978)) | ||
| - | * For proper carburetion it is recommended to check the following items as corrective measures for irregular running and spit-back which are symptoms of an excessively lean mixture. Also check for proper ignition. | ||
| - | * Check to see that the intake manifold seals and band clamps are installed properly. Using a squirt can with stanisol or kerosene, squirt some on these connections with the engine idling and see if there is any change (increase or decrease) in RPM which would indicate an air leak. | ||
| - | * The air cleaner backing plate must be flat against the carburetor flange gasket surface and the air cleaner mounting brackets must be adjusted and tightened properly per the FSM with no air leakage at the carburetor mounting flange. | ||
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| - | ===== High Altitude Modification Kit ===== | ||
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| - | * Carburetor modification kits (including jet(s) and an accelerator pump stop screw) were made available for 1200cc, 1340cc and 1000cc models to provide leaner fuel mixtures when operating at elevations above 4000 feet sea level. ((HD Service Blletin #M-730 dated June 15, 1978)) | ||
| - | * Normally, leaner fuel/air mixtures are required for proper engine operation as the elevation above sea level increases. This high altitude kit (27096-79 for 1979 XLH (XL), XLCH, XLCR-1000) should be installed where there is evidence of a rich condition causing loss of smooth combustion, stumbling on acceleration or such other carburetor issues at high altitudes. | ||
| - | * The kit for Sportsters includes a #160 main jet, accelerator pump stop screw and the front down tube on the frame. | ||
| - | * Install and adjust the acc pump stop screw to extend 1/8" past hole in lever. | ||
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| - | * Note, any motorcycle modified for high altitude operation must be converted back to standard if operated at altitudes below 4000 feet. An overly lean condition can cause engine damage. | ||
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| - | ===== Servicing the Keihin Butterfly Carb ===== | ||
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| - | Here are some excellent videos of servicing the pre-CV Keihin Butterfly carbs:((Used by permission - SportsterPavel at the XLForum - http://xlforum.net/forums/showthread.php?t=2055701)) | ||
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| - | * [[https://youtu.be/f_Ek37GEEN4|#1 - Tips and tricks.]]\\ | ||
| - | * [[https://youtu.be/OC75jFhAwLc|#2 - Disassembly and cleaning.]]\\ | ||
| - | * [[https://youtu.be/WaZHg2Brl3U|#3 - Assembly and testing.]]\\ | ||
| - | * [[https://youtu.be/5Q26WDIxWek|#4 - Testing and start-up.]]\\ | ||
