Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hello. My name is***** will be happy to assist you. There should be a square recess for the square head on your bolt to slide into, to prevent it from turning, as you thread your nut on. You must keep your bolt pulled forward, as you thread your nut on. The high revving, could be caused by your carburetor sucking in excessive air, due to your carburetor mounting nuts not being tight enough.
We can continue from here. Thanks!