Johnson 115hp 1998, trouble starting and idling.<br /> running hot. Replaced water pump. <br />Top right cylnder 95 other three at 110<br /><br /><br />Removed head to replace gasket to find damage to top right piston and head. Appears a chunk of metal dislodged and banged around dinging the head abit, and gougint the piston. Appears to be a chunk of the edge of the piston. I can see top ring which appears in tack, but the piston around this edge looks deeply damaged.<br /><br />What should I do?