The best way to free up stuck engine cylinders? [SOLVED]

Going to attempt starting a 2-stroke outboard boat motor soon. Engine has not been ran in approximately 10 years. Would any of your products be suitable to spray in the cylinders to begin to free them up before attempting this?

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Jim D.
Jim D.
3 years ago

Thanks for the question Bobby. What I would do: If you haven’t done so, get rid of the old fuel and start with fresh fuel. Add a can of Marine PRO to a half-gallon of fresh gasoline, then remove the spark plugs and crank the engine 5 or so times to draw the mixture into the fuel passageways. Then spray a healthy burst (figure 4 seconds) of Sea Foam Spray into each cylinder cavity. Put the plugs back in and let the engine sit for a night or two. While soaking, both treatments will working to reliquefy any sticky old fuel varnish that likely formed over time. Once you get the engine running, add more fuel. The can of Marine PRO will continue to clean as you run the engine.