Quote:
Originally Posted by DieselDoctor
Question - how worn are the throttle shaft bushings in the carb? If there is a lot of wear, so that the shaft is loose, you probably won't get a good steady idle until it is rebuilt or replaced. The gov expects the carb to respond but it has to take up all the slop first. A loose shaft can also be vacuum leak on some carbs, which effects mixture adjustments.
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From this point on I totally agree.
Check the throttle shaft. Sounds like it is loose.
Moving the governor from hole to hole should make no difference on how it runs. Only how sensitive the governor is. (That's the only reason I disagree with the first half of the statement.)