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Vacuum advance question


Mike8199

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How would i know if the vacuum advance is going out? Just rebuilt the carb, but the engine still having some issues. For instance when idling it sits at 800 where it should be, but randomly drops to the 650s and stays there till i blip the throttle. Then it randomly goes back to 650 rpm. Any ideas?

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How would i know if the vacuum advance is going out? Just rebuilt the carb, but the engine still having some issues. For instance when idling it sits at 800 where it should be, but randomly drops to the 650s and stays there till i blip the throttle. Then it randomly goes back to 650 rpm. Any ideas?

 

Vacuum advance is supplied from a port on the side of the carb. There is none at idle with the throttle closed. Vacuum is load dependent with very little at full throttle acceleration, more at part throttle and most when decelerating.

 

Liberally spray the linkages on the back of the carb with WD-40.

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