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I have a 2008 bobcat 250 w/ the kohler that is constantly revving while on high. This stops while welding though. The solenoid that controls the throttle is continously moving back and forth. Any ideas what causes this?
You could be looking at a governor sensitivity adjustment issue. Try moving the governor spring outward on the governor lever one hole and see if it improves. If it does but doesn't take all the surge out, move it out another hole if available. Note you will have to check/reset the maximum speed adjustment to spec.