I recently had a 20' Glasply with a 4 cylinder motor (I/O) that I was thinking about purchasing and took it into a marine mechanic to have it checked out. What I was told by the mech was that IF the engine was in good shape, that it would be a good buy because they are dependable. The word of caution from him was that if any work needed to be done that required replacement parts, the cost is pretty high due to the cost of parts. That was a red flag for me.
As it turned out, whoever did the initial motor work, did not do a very good job and the motor was not woth fixing. Kind of unfortunate because it was a nice looking boat and I was really looking forward to having a decent sized boat for "big" water fishing.
Good luck with yours if you do indeed end up buying that boat.
:cheers: