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There is a relationship between the governor arm and and carb throttle plate lever thst could be out of adjustment. You can download the M20 service manual from Kohlers.com . You can enter by signing on as a guest.

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Adjusting may help, especially if the throttle cable was replace/refastened. But some versions of this engine had a habit of breaking governor gears. That's not good, pretty sure you have to split the case to replace it. If the adjustment does not help, drain the oil and look for chunks of plastic gears.

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Unless this has always been an issue, I assume it is just acting up now. I would check to make sure all of the throttle and governor connections and arms, springs, etc are clean and intact, and move freely. Maybe hanging up on grass and dirt and such. Definitely want to fix though, grenaded Magnums get really 'spensive to fix.:O

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The throttle stop on the M20s is hard to get adjusted and the small cap screw that locks the stop can strip out very easy in the aluminum carb and then gain rpm because the stop is slippiing. What is the rpm that this engine is spinning? Is it holding rpm but higher than you like (throttle stop), or is it surging or over revving when load goes away (governor)?

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