Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

This is the issue I had also, and I did two things. I pulled the weights off and insured the Governor arms were perfectly centered in the notches where they rest in the flywheel, and I loosened the collar on the crankshaft that the Governor mechanism is anchored to, and shoved it firmly toward the flywheel and snugged it down.  That piece determines the geometry of the travel of the arms. If it’s not fully against the flywheel, the arms crash on the latch out mechanism and knock it off center.