Reply To: Power head assembly

[frankr]

Actually, measured with feeler gauges. Specs vary, but I believe it is 0.005″ min 0.015″ max. on the 5hp. Greatest cylinder wear generally is in the ports area. There is more to be concerned about than just ring gap. Side clearance in the rings, piston skirt clearance, etc.

My restored Cushman would start to seize at high speeds also. I finally figured out it was because I made it pretty with a nice coat of black paint on the cast iron cylinder fins.