Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Look at the throttle shaft and the butterfly in the carburetor, the shaft may e broken or the flap may be loose. If it is either one, you would be better off to replace the carburetor than trying to repair it.If carburetor throttle and flap are ok, then you may have engine governor problem!
I need the numbers off the engine , or the mower number from under the seat., to identify what engine this is.