When checking the valve clearances, it's fairly easy for me to turn the motor over with the stator nut and a wrench. The weight of my arm is enough to turn the motor past the compression stroke. I don't need to pull in the decompression lever to move the motor. I also hear what sound like air blowing by coming from the cam chain galley. From hearing other people state that they can stand on their kickstart lever and it won't move, it leads me to believe I need to replace the piston and rings. The bike is not smoking, but isn't very easy to start either. Warm days help. Thoughts on next step? I've never rebuilt the top end. I'm at least the third owner and the bike is 15 years old.