How long was it sitting? I know on one of my old motorcycles (Yamaha 500 DOHC) that sat for over 5 years the motor siezed.. turns out that the exhaust valve was in the open position when it was shut off.. As the motor sat in the sun it heated up, and at night it cooled...over and over.. that heating and cooling drew a lot of water vapor (condensation) into the motor over the years.. causing it to eventually rust. There was really nothing wrong with the motor, just sitting was enough to rust it up. I don't know if the same is your case, but it's something to think about. 
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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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