Re: Johnson 115 1980
Try a can of OMC Engine Tuner. Follow the instructions EXACTLY. Do not let it set in the motor longer than stated. Personally, I let it set for no more than 4 hours and then run it. I prefer to do it twice rather than let it set in the motor. After you are finished with the proceedure you will need a fresh set of Champion plugs.<br />Also don't be afraid to try another gauge. Also it may be down a few pounds if someone has installed the thick head gaskets.<br />Good luck!