Thread: SeaFoam

I asked my young nephew (who is REALLY info motors of all types) about seafoam and he became very excited. Said it was the best stuff ever made. He also told me that I would need to pour some directly into the carbs with the motor running. I think I've heard of that for cars, but for boat motors? How do you use this stuff?

Originally Posted by majflyboy

I asked my young nephew (who is REALLY info motors of all types) about seafoam and he became very excited. Said it was the best stuff ever made. He also told me that I would need to pour some directly into the carbs with the motor running. I think I've heard of that for cars, but for boat motors? How do you use this stuff?

Most folks mix it with there gas as per the instructions.

I have a 1997 Johnson 150. Typical older Johnson, use 1 can of Seafoam with every tank(27 gal or so) and my motor does run better. I like it better than Stabil for the winter also if you store your boat.

What's he's talking about is "de-carbing" the motor. Basically, you warm the engine to operating temperature then over-seafoam the motor to the point that it dies with the seafoam in the combustion chamber. Let it sit for an hour or more, put fresh gas in it and run the DonDon out of it. It's gonna smoke like one of those skeeter sprayers in Cleveland, MS in August, but it will blow out a lot of the carbon buildup in the combustion chamber, which is one of the leading causes of kablooey for 2 strokes.

Different engines, there are different techniques to get the Seafoam into the chamber for the soaking. Seems like yours is a 25 merc with a built in tank on that tracker. If you have access to a small portable tank, you can "over seafoam" from that tank, then switch back to your regular for the running the DonDon out of it step. Then again, if you're comfortable with going direct to the carbs, you can do that as well. Other motors have a port you can attach a can of squirtable stuff made by the manufacturer that does the same thing.

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