I stand by my comment of a clearance issue in one of the cyl.
Laugh if you may, but on a episode of Biker Build off they used high compression pistons in a stock HD motor and had the exact sam thing happen. the motor would rotate almost 360* both ways then abruptly stop........pistons where hitting the valves.
Laugh if you may, but on a episode of Biker Build off they used high compression pistons in a stock HD motor and had the exact sam thing happen. the motor would rotate almost 360* both ways then abruptly stop........pistons where hitting the valves.