I'm the new owner of a Bass Boat with a force 150 outboard on it. The engine is easy to start, runs great and will push the boat about 46mph. I did a compression check to see if all 5 cylinders were equal and they are all within about 5psi of each other. Here is my question: The compression on all the cylinders is between 50 to 55psi. As well as the motor runs, I can't see where the engine could be damaged internally. I read on a few other forums that compression should be between 90 and 110psi, but that was on other makes of outboards. I thought that maybe there was carbon buildup around the rings so I did a decarb on the engine today and nothing really changed as far as compression. After the decarb, I ran it for awhile at about 3/4-throttle to clear it out and again, it ran great. It does idle better after the decarb treatment. I'm not looking for "the engine is junk, get rid of it" or "will make a good anchor". Just wanting to know if Force engines have a lower compression than other brands of engines. Any info would be appreciated.