gatorforge
CB750 Enthusiast
So I'm currently working on a top end rebuild for a 1972 CB750. When I got the bike, the engine turned over easily, but as it hadn't been run in a while and I had no idea on the internal condition of the engine, I decided to do a top end rebuild just to be safe. I tore it down with minimal issues, replaced the piston rings, honed the cylinders, and got to work on the reassembly (after measuring all parts of course). I cleaned the pistons (they are in very good shape) and put the cylinders back on (kinda a nightmare). While I was working to get the cylinders back on, I noticed the motor was not moving completely freely, It only had a partial range of motion in one direction, but moved completely freely in the other direction. All turning of the crank was done via the bolt under the points cover. Once the cylinders were on, it only moved a little in either direction, and with the heads mounted, it will not turn either direction at all. There aren't any spark plugs installed so there shouldn't be any compression. Anyone who could provide insight into why the motor is no longer turning over would be extremely helpful. Especially if it does not require removing cylinders/cracking case.
Thanks,
Lance
Thanks,
Lance