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!
You say it over fuels? Or is it stalling out or loosing power? This would be twin engine, jave yo ran a cylinder balance test? Loosen the spark plug wires, and with engine idling, remove one wire at a time, and if engine dies, when one wire is removed, the opposite cylinder is not firing. Check t for spark and compression. Is this Kohler engine?
Let me opt out, have to go to Dr appointment. Maybe someone else can pickup up. sorry.
I see no one replied! I am back! Where are you pinching the fuel line? Do you have the standard pulse fuel pump, no one has added an electric fuel pump? From what you describe, the governor is adding more fuel by opening the carburetor to maximum, because of the load applied. With fuel line pinched, does the engine lack in power?