Why would you buy someone else's troubles? I disassembled a 112spl today that had low compression on one cylinder. It turned out to be the center main bearing shattered, which would explain the piece of metal imbedded in #4 cylinder head. The engine is junk. Sure, there are common problems and then there are the not so common problems. It may have low compression due to being burned by a clogged carb or a double firing ignition system or a bearing that let loose. Run from this as fast as you can or simply talk him down to a really low number on the boat.
I'm looking at this boat motor and trailer, to possibly purchase. I don't know the year yet on the boat or motor. The owner says that one of the cylinders has low cranking compression. What could cause this? Is it fixable? Was it common with these motors? Price for the 17' Crestliner boat, 115hp motor, trailer, downrigggers, and 6hp kicker seems pretty reasonable. Should I run?!?!?!?! Or look into it further? What do you think it's worth? Thanks!