I have an 85 hp force that runs fine in the driveway but under load bogs right down. It loses power in one cylinder. This happened out of town of course, took it to a marine mechanic who was known to work on these old motors. He said it was either a clogged exhaust port or a blown seal in the 3rd cylinder after checking everything else out, plugs, fuel, compression, etc. He said he has seen it before. I am not putting that kind of money into that motor so I am turning some wrenches myself and was wondering what anyone here might have to say about this. Anyone else had this problem? Thanks