I have lost compression in the front cylinder of my 1998 GP1200. The other 2 cylinder read the same 125psi. Piston still moves up and down. It's never simple I am sure, does anyone have recommendations on problem.
Take the head off. I am sure the piston is melted or a hole in it if you have no compression. Usually exhaust side melts. If no water is in it now, and the piston isn't very clean, then head gasket good but you need a gasket kit anyway now.