vintage McCulloch MC-6 go kart engine parts ,  90cc go kart engine, this is a running engine,  bore is fresh honed to 2.128 (stock bore 2.125) for +.004 piston, stroke is 1.5, new seals and piston rings, pull start with choke equipped Tillotson carb with air filter cup included. motor has high compression. 3rd port or side port is blocked. test run on bench. There is a small blemish on crank taper, I decided not to weld up as it does not affect performance.  sale is final sold as is for parts ships to lower 48...