I just put the first new piston, rings, timing chain in my 04 yz450f. Put a new OEM cylinder on. The piston and rings are JE 13.5:1. Did nothing to valves or cams, still original. I freshened since it had never been done and I'm starting to get back in mx again, wanted the gains of HC at high altitude. So I kicked my leg off trying to start. TDC is accurate. When I kick it and when I manually rotate the flywheel, the compression seems to be lacking. rotating the flywheel clockwise offers barely any resistance (if that helps). Any thoughts on where to start? Yes, it is my first top end rebuild, but I have done past valve adjustments no problem and am good with a wrench. Thanks.