Hello, im really new to outboards. I have experience in small engines, was a crew chief on f15's and done hundreds of small engine rebuilds, but need some advice on a 85hp force. A guy at work gave me a 1991 spectrum bass boat. He said he was on the water and it quit running then he could not restart it. He said he checked compression and #2 cylinder compression was low. So when i got it home i noticed the starter was not engaging, so i bought a new one and did water impeller . Boat fired right up after manually choking it. Fired and started nicely about half dozen times. It sat few days then no start. I ended up checking compression and 1 and 3 are at 120, cylinder 2 was 20. Pulled the head and a ring was broke, cylinder wall looks good, so went to order rings. The boat does not have a model number anymore, and the guy i got it from said it was a 1989. So i got those rings that are for a 3.00 bore. They are wrong had a huge ring gap. I bought some telescopic gauges and checked and looks like the bore is 3.325. I saw somewhere on here that the 1990's had two sizes of rings? So im guessing its a 1990 85hp? Looks also as though 1990 was last year the 85hp was made and then went to 90hp. Does anyone know what size rings this should have and where in the world i could get some? I talked to the nearby shop and they said they refuse to work on the force motors, but if i wait till they are slow in winter they might look at it. Any info is greatly appreciated .
