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!
Rapid overheat can be sticking thermostat, or a water pump that is not circulating the coolant, due to bad impeller . Remove the thermostat, and try running without it, and watch the radiator cap for circulation