Little engine delimma I need help with.

"With zero compression I would suspect a valve hung open. Pressurize that cylinder with compressed air and listen to the intake and exhaust for leaking air...."

I agree with 55Dave here, "0" compression=stuck valve, leak down testers are in the same dept as compression testers and almost as cheap to buy and a must in every tool box, if the valve is stuck the Mercury Power Tune mentioned earlier by joesbp dose work very well, I actually am a Mercury Dealer and use it all the time, I also have used the Marvel Mystery oil and it works well for stuck valves too