So my bike jumped timing due to a bad cam chain. I dont think that the valves hit the piston when it happened and the bike would kick over and have decent compression. I didn't verify with a compression gauge. I put a new cam chain in and when I slowly turn the motor over the piston comes into contact with the valves. Any suggestions on how to check if the cam gear slipped or do I need to pull the head and check the valves to see if there is any other damage? Thanks.