Should I use Sea Foam or Marine PRO for my Kawasaki Jet Ski? [SOLVED]

I have a Kawasaki Jet Ski with a 2-stroke 750cc engine that has separate tanks for fuel and 2 cycle oil (oil injected). Has been sitting about 2 years and is hard to start and running rough. Can I use Marine PRO in the fuel tank? If so, how much per gallon of fuel? Is there a best practice for using Sea Foam or Marine PRO in this engine?

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Jim D.
Jim D.
3 years ago

Thanks for the question Travis. Here is what I would do: Get the fuel tank down to a low amount, anywhere less than a gallon to 2 gallons.  Add a full can of Marine PRO to the fuel tank, start the engine on water and let it idle for 8 to 10 minutes to draw the Marine PRO concentration through the carburetor circuits. Shut off the engine and let everything soak overnight or longer (2 or 3 days is great). Add a gallon of fresh gas and start the engine… let the Jet Ski idle for at least 5 minutes to get the upper engine hot, then take it for a spin to create more heat and compression. The engine should start to recover its rhythm as you work through the gallon of gas.[Will still have a lot of Marine PRO in the tank to continue cleaning.]

Note: If you can’t find Marine PRO in your area (it’s June 2019 and still very new to the market), use Sea Foam Motor Treatment.

2 years ago

I have a 2019 Kawasaki 310X with the supercharger. I’ve been told to spray Sea Foam into the supercharger port after each use. The straw on the sea foam doesn’t fit. Is there a special straw or trick to get it to fit or is there another way to get this done?

Last edited 2 years ago by Paul