Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Engine model number? Is the throttle flap in the carburetor still attached to the throttle shaft? shaft not broken? If not, problem is the internal governor parts.
Late model twin OHV engine. So is the carburetor throttle shaft and flap ok, not separated?
if the carburetor butterfly is closed, there should be no high revs! You are looking at the throttle, not the choke flap?
It would have to be a big vacuum leak! Never saw one that did this, usually it is broken throttle shaft.
let me know!
I see question is still open, did you find problem?