Had a major overheat. Top right cylinder has very low compression, 15LB, All others at 115. Pulled the head cover, looks like the rings came off and caused a hundred or so pits on the piston as well as inside the head cover, can not see cylinder walls yet. My questions is could just the one piston be replaced? Could just that one cylinder be bored if it is also damaged?
Called local marina {Columbus, Oh} they said sounds like a total rebiuild needed, 2500.00 for the motor, 1000.00 for parts, rebuild carbs and labor. 3500.00 total, Boats in great condition. These boats if running and look decent are worth only about 3000.00 or less.

Thanks in advance for any help or suggestions