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#1
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Hi and welcome to the site. There are a number of really good guys here that can advise you on the engine etc. But from my own experience and reading the manual for my engine, the engines compression should be checked with the engine warm and all plugs removed. I'm thinking that if it sat for any length of time it probably needs to be run a little before you can get an accurate compression test. It's entirely possible/probable that you have stuck rings from the sitting.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless. 
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#2
08-21-2010, 07:59 PM
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Thanks Destroyer. I'm wondering the same thing - the readings may not mean a whole lot. I would guess that any lubrication on the piston rings is long gone by now, and with that there is not a good seal. There's likely a coating of rust on the walls, too. But I have no real experience in this area.
If I could, I would drain all the fluids and the gas (two year old gas is still in the tank) Then I would get some lubricant and squirt it down the spark-plug holes and turn the engine over a few times to work the lubricant in there. But since its not mine, I can't really do that. And if I did (or the seller did), would the new compression numbers be useful, or would they give me a false sense of security?
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