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Jim, the first thing to check is for a binding linkage from the governor to the carb lever, pay particular attention to the cotter pin in the linkage on top of the carb [a common problem area].. Move the linkage by hand [engine off] & verify it moves smoothly.. ~If the linkage moves smoothly without any hang-ups or binding then look closely at the leaf spring on the governor lever..If that leaf spring has a crack in it or is otherwise rust pitted or damaged it can cause erratic idling & erratic throttle control. [that spring MUST have a good solid strong spring action to it] ~A failing governor can cause problems but that spring is what actually advances the throttle when a load is applied, the governor tries to keep that from happening.. Disconnect the linkage at the carb & operate the carb by hand while pulling on the removed linkage with the other hand.. You should feel the governor pulling on the removed linkage when you rev the engine up, it should feel smooth & not jerky.. ~When all is tested per above move the hand throttle lever to wide open & hold the carb wide open [engine off] then adjust the linkage rod [the one between the governor & carb] to be 1/2 to 1 hole short of entering the hole on the carb lever, then re-install it.. ~That erratic idling could also be carb or idle stop spring related [make sure the idle stop screw is contacting & depressing the idle stop spring at idle].. Also make sure the stop spring is there & not bent.. ~If everything seems ok in the linkage & governor control you could have a carb metering problem.. JDClooney@aol.com
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