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techtalk:ih:carb01r [2020/08/03 23:25] hippysmack [Poor acceleration] |
techtalk:ih:carb01r [2020/08/03 23:45] hippysmack [Keihin Butterfly Carb (non CV) Functions, Adjustments, Tuning] |
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| * [[techtalk:ih:carb01q|Rebuilding the Keihin Butterfly Carb]] | * [[techtalk:ih:carb01q|Rebuilding the Keihin Butterfly Carb]] | ||
| * [[techtalk:ih:carb01p|Keihin Butterfly Carb Identificaton]] | * [[techtalk:ih:carb01p|Keihin Butterfly Carb Identificaton]] | ||
| + | * [[techtalk:miscres:miscres05#tsb_650-699|See TSB #694 for introduction information on the Keihin butterfly carb]]. \\ Click the link to view the TSB page in the Sportsterpedia. Then click on the "Y" next to #694 to view / download the PDF. \\ | ||
| + | \\ | ||
| For Late 1976-1987 Sportsters. \\ | For Late 1976-1987 Sportsters. \\ | ||
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| * If the problem is crud, then it can often be fixed at least temporarily by partially emptying the float bowl. ((Ironmick of the XLFORUM http://xlforum.net/forums/showthread.php?t=507935&page=2)) \\ While running, shut off the fuel valve, run the bike until it begins to sputter, then turning on the fuel. \\ The sudden rush of fuel may dislodge the crud and you are good to go for a while. This can be done either while riding or while just idling. \\ This should wash out debris in the float valve / seat. | * If the problem is crud, then it can often be fixed at least temporarily by partially emptying the float bowl. ((Ironmick of the XLFORUM http://xlforum.net/forums/showthread.php?t=507935&page=2)) \\ While running, shut off the fuel valve, run the bike until it begins to sputter, then turning on the fuel. \\ The sudden rush of fuel may dislodge the crud and you are good to go for a while. This can be done either while riding or while just idling. \\ This should wash out debris in the float valve / seat. | ||
| * **Damage or debris around valve seat**. | * **Damage or debris around valve seat**. | ||
| - | * **Too high float level**. | + | * **Too high float level**. \\ See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above. |
| - | * See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above. | + | |
| * **Worn float mounting tabs, float pin or loose float retaining screw**. | * **Worn float mounting tabs, float pin or loose float retaining screw**. | ||
| * **Cracked or damaged overflow tube in the float bowl**. | * **Cracked or damaged overflow tube in the float bowl**. | ||
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| **Check for**: \\ | **Check for**: \\ | ||
| + | * **Float setting too low**. See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above. | ||
| * **Improper idle mixture adjustment**: \\ See [[techtalk:ih:carb01r#overall_adjusting_procedure|Overall Adjusting Procedure]] above. | * **Improper idle mixture adjustment**: \\ See [[techtalk:ih:carb01r#overall_adjusting_procedure|Overall Adjusting Procedure]] above. | ||
| * **Damaged mixture screw**. | * **Damaged mixture screw**. | ||
| Line 655: | Line 657: | ||
| * **Clogged slow jet**. | * **Clogged slow jet**. | ||
| * **Loose slow jet**. | * **Loose slow jet**. | ||
| - | * **Air leaks**. | + | * **Air leaks**. See [[techtalk:ih:carb01r#running_lean|"Testing for air leaks"]] below. |
| * **Excess or sloppy fuel from accelerator pump**. | * **Excess or sloppy fuel from accelerator pump**. | ||
| * **Improper fast idle adjustment on 79-up carbs**: | * **Improper fast idle adjustment on 79-up carbs**: | ||
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| ===== Poor acceleration ===== | ===== Poor acceleration ===== | ||
| **Check for**: \\ | **Check for**: \\ | ||
| - | * **Improper idle mixture adjustment**: \\ See [[techtalk:ih:carb01r#overall_adjusting_procedure|Overall Adjusting Procedure]] above. | + | * **Improper idle mixture adjustment**: See [[techtalk:ih:carb01r#overall_adjusting_procedure|Overall Adjusting Procedure]] above. |
| * **Clogged accelerator pump system**. (I.E. check valves in brass nozzle, check ball in bowl / cover, worn / torn pump diaphragm). | * **Clogged accelerator pump system**. (I.E. check valves in brass nozzle, check ball in bowl / cover, worn / torn pump diaphragm). | ||
| * **Clogged bypass (idle transfer) ports**. | * **Clogged bypass (idle transfer) ports**. | ||
| * **Clogged or too small of a slow jet / bleed tube**. | * **Clogged or too small of a slow jet / bleed tube**. | ||
| - | * **Float setting too low**. \\ See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above. | + | * **Float setting too low**. See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above. |
| ===== Hard Starting ===== | ===== Hard Starting ===== | ||
| **Check for**: \\ | **Check for**: \\ | ||
| - | * **Improper idle mixture adjustment**: See [[techtalk:ih:carb01r#overall_adjusting_procedure|Overall Adjusting Procedure]] above. | + | * **Improper idle mixture adjustment**: \\ See [[techtalk:ih:carb01r#overall_adjusting_procedure|Overall Adjusting Procedure]] above. |
| * **Choke not adjusted properly / not operating properly**. | * **Choke not adjusted properly / not operating properly**. | ||
| * **Clogged jets or internal passages in the carb.**. | * **Clogged jets or internal passages in the carb.**. | ||
| - | * **Wrong float setting**. | + | * **Wrong float setting**. \\ See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above. |
| - | * See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above. | + | |
| * **Fuel valve on tank not turned on**. | * **Fuel valve on tank not turned on**. | ||
| * **Loose bowl screws**. | * **Loose bowl screws**. | ||
