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  1. C

    1977 9.8hp compression question

    I checked the compression on my motor both cylinders were 60psi I put a little oil because it has been sitting up a while, I pulled it a couple times let it set and came back later and checked it and it almost doubled 110-115psi could this be just because the rings are in poor shape and...
  2. C

    How to check compression on 9.8hp

    I need to know how much pressure each cylinder is supposed to have and do you pull the rope once or twice before you read the gauge ?? I know I need to get a manual,but I'm trying to see if this motor is worth salvaging before spending money
  3. C

    Help What Year Please 80hp Merc

    I have been having trouble finding the serial number,I beleive I located it on the side of the block 8473920 80hp Mercury I will post pictures if needed
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