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techtalk:ih:carb01r [2019/09/13 21:23] hippysmack [Choke] |
techtalk:ih:carb01r [2019/09/20 18:12] hippysmack [High Altitude Modification Kit] |
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| ====== Keihin Butterfly Carb (non CV) Functions, Adjustments, Tuning ====== | ====== Keihin Butterfly Carb (non CV) Functions, Adjustments, Tuning ====== | ||
| + | See also in the Sportsterpedia: \\ | ||
| + | * [[techtalk:ih:carb01#keihin_butterfly_or_non-cv_carb_late_1976-1987|Keihin Butterfly Carb Basic Information]] | ||
| + | * [[techtalk:ih:carb01q|Rebuilding a Keihin Butterfly Carb]] | ||
| + | * [[techtalk:ih:carb01p|Keihin Butterfly Carb Identificaton]] | ||
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| For Late 1976-1987 Sportsters. \\ | For Late 1976-1987 Sportsters. \\ | ||
| If you are opening up your carb for the first time, you need three things: \\ | If you are opening up your carb for the first time, you need three things: \\ | ||
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| * 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. | * 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. | ||
| - | ==== 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. | ||
| ====== Idle Speed and Air/Fuel Mixture ====== | ====== Idle Speed and Air/Fuel Mixture ====== | ||
