Home › Forum › Ask A Member › 1956 15 hp Evinrude Model 15016 › Re: 1956 15 hp Evinrude Model 15016
The engine tuner can certainly help free up stuck rings, but it is not a lubricant and shouldn’t be left inside the engine for more than a few days without starting it to expel the tuner.
I guess I would tilt the engine so the crank is as close to horizontal as possible, then move the #1 piston toward the top of travel and fill the cylinder with tuner…Let it sit overnight, then retest to see if your rings freed up any. Once you have the engine running, you can repeat this process a few more times after running the engine… You can pump the tuner into the carb while the engine is running as well, before filling the cylinder and letting it soak. Be sure to start the engine up and run it the next day. I’m sure the rings will free up and your compression will improve.
You should probably go a little heavy on the oil mix while doing these tuner treatments.