Re: 71/2hp evinrude

[wiscoboater]

You can try laying the motor down, plugs facing up and level. Shoot some OMC power tune or Sea Foam deep creep into the cylinders and reinstall the plugs. Let sit overnight and repeat. If the rings are stuck, this might loosen them up somewhat and provide a better compression reading. I would not expect a huge increase. Like Jerry said, it sounds like and may be time for a rebuild. Don’t let some slick talking parts salesman or neighbor talk you into anything less then the 16/1 oil mixture Jerry indicated. Todays oils are good…but they are not THAT good to alter from that mixture.