Sea Foam is used to decarb the engine. Some say it does both decarb and stabilize but I like to use stabil when I store the boat and Sea Foam in season.

If you have not decarbed your engine, using Sea Foam will make an amazing difference in the way your engine runs. After only one tank my carb engine now runs like a fuel injected motor. After several tanks I plan on doing a full decarb.