When I was putting my engine back together today I got to the point where I was about to torque down the cylinder bolts when I decided to check to make sure the piston moved freely up and down through the cylinder wall. When I started to turn the flywheel with the rachet, everything seemed to be ok and then it locked up. I thought maybe it got stuck on the cam chain or something so i turn the other way and rotate almost a full cycle and boom happens again?!? so both ways before a full cycle the piston stops. I don't want to force it through and I know many of you have torn your motors down, is this a normal occurance. Maybe its the starter? Should I be able to do a full rotation using the flywheel? I ended up taking the wall and piston off just to make sure they had nothing to do with the binding. So with just the crank and rod staring me in the face its binding just before full turn. I checked to see if it was in gear as well before you knuckleheads start chiming in. And even if it was it wouldn't rotate that much.