Originally had a problem with top cylinder having low compression with only 40 lbs. The others were all in around 125. Took it out not realizing the impeller was shot and engine overheated and left me stranded. Took it home and tested the pistons again and this time had 100 in the top and 90 #2, 90 #3, and 110 in #4. I don't know how the compression came back in # 1 and has dropped in the others.. Any ideas please advise. Looking for ideas on how i can bring this compression up.. will a good run do it? Boat has been sitting for a while.
Tim
Tim