sorry it's hard to explain lol. it mostly just spins, but we did get it to crank over once or twice (after a long,long) time of trying. I know at FIRST when we pulled the side case off, and it was still on the bike, it wouldnt spin, we had to break it lose if im not mistaking. we didn't take off the starter clutch from the fly wheel (stays together by allen wrenches right?) because we dont know much about it at all. so we took a flywheel,starter clutch straight out of one of his motor that we know is good. I hope it works..