I just bought a 1996 Johnson 150 That has been sitting outside for years. The last registration on the boat is 06' The engine looks like new under the cover and doesn't look like any wrenches have touched it yet my compression is 55 to 65 on all cylinders. I assume this is because of stuck rings from sitting. I got the engine to fire but shut it off imediatlly The question is can I bring the compression back up without re-ringing it.