Re: 1994 Force Mercury 90 hp piston ring info
There wasn't a huge scored along the piston wall. But engine sure was overheat and the ring at the bottom cylinder get stuck pretty well. I sprayed penetrating oil (rust bolt spray) on it and let it sat over night and that didnt help. SO had to take out the flat screw driver and hit it with a hammer to break loose parts of the rings off.
I still can use the OEM piston, just need to file the groove a bit larger. And its only the bottom groove/ring. The top one has a bit of sand damage but not too much where it would be useless. Its probably just need rings replace on the last cylinder. The rings on the other two cylinders are still good. I got a low compression of 100psi from them when the engine was dried up and at neutral.
Now its lubed up and I reckon it would be over 120psi, which is good enough. I found a ring set on Ebay for $29 and it took some cross reference to get the correct set. I will only use the bottom ring and keep the top one. Everything is still OEM, down to the gaskets set which seems almost new.
This engine wasn't in use much and when it was, the previous owner didnt flush it right. He told me he sprayed water at the nozzle intake when out of the water 'like a jetski'- what a goof i thought when he said that. But anyway, hopefull I can get it back and running by this memorial day weekend to take it out for a spin.