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Happy New Year guys. I appreciate the detailed info. After all the homework you guys did, it looks like I have homework to do. Now is a good time to get it done before spring. I'll let you know how it works out. Thanks again to all of you!

That's the same test I did before. Exactly the same way I saw the compression hit 150. I guess the cylinders have a few issues. I'll check it again after running it once the weather warms up some. Thanks!

Just got a few minutes to go back to the basement to try it again (uninterrupted this time). I did each cylinder three times and got an average of 75-80 on both cylinders. I'm on the fence about the compression now.

I was just cruising iBoats website on some other topics and started to feel REALLY dumb. I found some info on compression testing. I realized that my first test (low readings) I left one spark plug in while the other cylinder was being tested. The second test (high readings) was with both plugs...

That's good to hear. I have seen a few others here (and on the street) say that the oil trick means bad news. Hopefully I'm in good shape. Thanks Friend!

I've got a 1986 Mercury 6HP short shaft that was rebuilt about a year ago and used lightly since then with varying results. Some days it will blow your hair back, and on others it will not even stay running once given some throttle. It always is a little rough to start in the morning, but starts...