Compression numbers **URGENT**

[salmonee]

I'm thinking about getting this aluminum boat. The boat is a 2000 17' smokercraft with a 1998 60hp yamaha 2 stroke. I ran the boat, motor seem fine. I did a compression check and the numbers are 100, 110, 110. I know the compression numbers are to be within 10%. The 100 is right at the edge of 10% as you can see. Is this something to be concerned about? What am I looking at for long term repair costs if this cylinder is about to go bad?

 

[tashasdaddy]

Re: Compression numbers **URGENT**

i would do a decarb treatment on the motor, i has been known to free up stuck rings, and bring the compression up. also could be a head gasket going bad.

Decarb, take a can of seafoam put 3/4 of it in the gas tank, with only 1 gallon of premixed gas. put the rest in a spray bottle. start the engine, and let it come up to temperature. then remove plugs, and them some real good shot of seafoam into the cylinders, replace plugs, let sit 15 minutes. restart, and spray the rest of the seafoam into the carbs, so the the motor almost stalls, wait and repeat until the seafoam is gone.then take for a wide open spin. then put in new plugs, ad premixed gas to the tank, and take it for a wide open throttle spin. it is going to smoke like a house on fire, during this process.

afterwards compression.recheck