Had a melted piston and went with the Cruisin 836 kit. Got he head on and torqued. Put on the towers and went to install the cam . I don't have enough slack to get it mounted. I can spin the chain with a little resistance so am wondering if it could have come off the crank. I didn't think that was possible. I also thought it might have been affected by the tensioner. In a previous thread, it said if you screw it in, it gives more slack. Looking at it I can't see that is the case. If it came off the crank, is it possible to get it on with the head in place? I love working on this bike but would much more like to ride it. Thanks for any tips or encouragement.