Have a 96 johnson 115 hp heard some different noises coming from engine. Run a compression test #1 45 #3 65 #2 110 #4 115, pulled head on 1 & 3 cylinders and #1 piston had flaked of edges and has lots of side to side play. #3 not as bad, there's no cylinder scaring and head in good shape. Okay now the problem, been an auto tech for 17 years and i bought the boat from a friend, its a 20' roughneck and has a jet drive. My fault for not checking the boat out well, need some input on the johnson motor and jet drive draw backs. And yes the boats is put up till repair or replacement is made.