Small Engine Troubleshooting Problems? Ask a Mechanic Now.
The throttle plate in the carburetor may be loose on the throttle shaft and is hanging. Tapping the throttle lets it seat. The flap has to close tightly against the inner carb housing, or idle is affected. Usually the carburetor has to be removed and the throttle plate reset on the shaft so it closes better.
Thank you. I had an oversized carburetor on a small block Ford, and I had to work on the throttle flaps to get them to close, otherwise idle was way too high! It may not be the problem, but it will be related to the throttle valve!
Ok. let me know.