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techtalk:ih:carb01r [2019/10/10 15:54] hippysmack [Idle Speed Adjustment] |
techtalk:ih:carb01r [2019/10/10 16:08] hippysmack [Idle Speed Adjustment] |
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| Adjust the throttle stop screw to make the engine idle at the desired speed with the throttle closed. ((1970-1978 HD Sportster FSM pg 3-61)) \\ | Adjust the throttle stop screw to make the engine idle at the desired speed with the throttle closed. ((1970-1978 HD Sportster FSM pg 3-61)) \\ | ||
| **Notes**: \\ | **Notes**: \\ | ||
| - | Never set idle adjustment to the lowest possible speed. An extremely low idle causes bearing wear oil consumption and slow speed acceleration. \\ By ear, idle as slow as it will go, then speed it up a healthy bit. Recommended idle speed per the -78 FSM is 700-900 RPM. ((1970-1978 HD Sportster FSM pg 3-61)) \\ | + | Never set idle adjustment to the lowest possible speed. An extremely low idle causes bearing wear oil consumption and slow speed acceleration. \\ By ear, idle as slow as it will go, then speed it up a healthy bit. \\ |
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| + | Recommended idle speed per the -78 FSM is 700-900 RPM. ((1970-1978 HD Sportster FSM pg 3-61)) \\ | ||
| However, below 900 is not suggested by most owners. Some have had bearing failure with lower idle settings. \\ | However, below 900 is not suggested by most owners. Some have had bearing failure with lower idle settings. \\ | ||
| The -85 up to the -90 FSMs raised the idle requirement to 900-950 RPM. \\ | The -85 up to the -90 FSMs raised the idle requirement to 900-950 RPM. \\ | ||
| + | There have been many arguments pertaining to the need for the engine to have a slow Potato, Potato sound "or it ain't a Harley". \\ | ||
| + | Well a Sportster is a Harley, make that a high revving Harley (unlike the slower revving BTs), and a Sportster is not meant to be idled that low. \\ | ||
| + | Forget about the peer pressure or berating of the higher RPM and tune your Sportster for performance and longevity as it was meant to be. ((Hippysmack)). \\ | ||
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| Turning the screw clockwise opens the throttle plate (faster idle). \\ | Turning the screw clockwise opens the throttle plate (faster idle). \\ | ||
| Turning the screw counterclockwise closes the throttle plate (slower idle). | Turning the screw counterclockwise closes the throttle plate (slower idle). | ||
