My son took the motor to tech school to put new rings in it and it ran well before he tore it down. Now I’m getting water in both cylinders. It will run if I pull the lower unit off and run it for a short time. Cranks seals are new, exhaust gaskets are new, reeds are good. I have a head gasket...
I have a 1988 Mercury 25hp outboard. Electric start with remote control. When I purchased the motor it had a bad vibration/miss. I found the magnets had broken inside the flywheel. Replaced the flywheel and the stator (damaged from the magnet failure). Ran great for first season. 3/4 of the way...