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techtalk:ih:carb01r [2019/10/15 00:33] hippysmack [76-78 38mm Keihin's] |
techtalk:ih:carb01r [2019/10/17 04:00] hippysmack [Troubleshooting] |
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| Any wiring that that may get too hot / catch fire doesn't need gas nearby. \\ | Any wiring that that may get too hot / catch fire doesn't need gas nearby. \\ | ||
| - | While installing the accelerator pump, the diaphragm goes on first, then spring, then cover. \\ | + | |After adjusting. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Accelerator pump from the outside. \\ (see caution above) ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))| |
| - | Make sure those two square section O-rings are in place and in good condition. Else, gas will leak out there instead of getting squirted into your engine. \\ | + | |{{:techtalk:ih:carb:keihin_butterfly_carb_15_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_16_by_hopper.jpg?direct&300|}}| |
| - | + | ||
| - | |After adjusting. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Accelerator pump from the outside. \\ (see caution above) ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Check position of O-rings. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))| | + | |
| - | |{{:techtalk:ih:carb:keihin_butterfly_carb_15_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_16_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_17_by_hopper.jpg?direct&300|}}| | + | |
| ===== Andrews High Flow Accelerator Pump (Keihin butterfly) ===== | ===== Andrews High Flow Accelerator Pump (Keihin butterfly) ===== | ||
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| Most carburetor problems really are electrical, just like the old timers always say. (Hopper) | Most carburetor problems really are electrical, just like the old timers always say. (Hopper) | ||
| + | ===== Altitude and Ambient Temps ===== | ||
| + | |||
| + | * 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. The decreased jet sizes and accelerator pump modifications 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. | ||
| + | * High Altitude Kits: | ||
| + | * 1978 1/2 FLH-1200 (27094-78). \\ Consisted of a 160 main jet, 72 slow jet and a label for the downtube. \\ In addition to installing the parts on the carb, the FLH-1200 models required changing the position of the accelerator pump spring pre-load position. \\ The spring should go in the top (#1) position as opposed to the #3 (std) position on the pump lever. | ||
| + | * FX/FXE/FXS-1200 (27095-78). \\ Consisted of an accelerator pump screw and a label for the downtube. \\ Install and adjust the accel pump stop screw to extend 1/8" past hole in lever. | ||
| + | * XLH/XLCH/XLCR-1000 (27096-79). \\ Consisted of a 160 main jet, an accelerator pump screw and a label for the downtube. \\ Install and adjust the accel pump stop screw to extend 1/8" past hole in lever. | ||
| + | * FLH-80, 1340cc, (27093-78). \\ Consisted of a 155 main jet and a label for the downtube. | ||
| + | |||
| + | **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. | ||
| + | |||
| + | Hotter Air = Less Oxygen → Richer Mix ((stevo of the XLFORUM http://xlforum.net/forums/showthread.php?t=49078)) \\ | ||
| + | Colder Air = More Oxygen → Leaner Mix \\ | ||
| + | Higher Barometric Pressure (Low Altitude) = More Oxygen → Leaner Mix \\ | ||
| + | Lower Barometric Pressure (Higher Altitude) = Less Oxygen → Richer Mix \\ | ||
| + | Higher Humidity = Less Oxygen → Richer Mix \\ | ||
| + | Lower Humidity = More Oxygen → Leaner Mix \\ | ||
| ===== Fuel overflow ===== | ===== Fuel overflow ===== | ||
| The overflow tube is a safety feature in case the float needle does not prevent flow and the bowl gets full. ((IXL2Relax of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071025)) \\ | The overflow tube is a safety feature in case the float needle does not prevent flow and the bowl gets full. ((IXL2Relax of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071025)) \\ | ||
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| ====== Helpful Links ====== | ====== Helpful Links ====== | ||
| **Video**: \\ | **Video**: \\ | ||
| - | 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)) | + | Here are some excellent videos of servicing the pre-CV Keihin Butterfly carbs: ((Used by permission - SportsterPaul at the XLForum - http://xlforum.net/forums/showthread.php?t=2055701)) |
| * [[https://youtu.be/f_Ek37GEEN4|#1 - Tips and tricks.]]\\ | * [[https://youtu.be/f_Ek37GEEN4|#1 - Tips and tricks.]]\\ | ||
