Sea Foam for a 2007 Honda TRX 400EX that’s been sitting in storage? [SOLVED]

I have a 2007 Honda TRX 400EX that has been sitting in storage with fuel in the tank for 5 years. We are trying to figure out the best way to get it cleaned up and running. I remember my dad used this stuff in my F350. Will it work for cleaning up my ATV?

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Jim D.
Jim D.
30 days ago

Hi Ashley,

Sea Foam certainly can help! Over time, varnish and residues will build up in a fuel system if it has been sitting a while. Sea Foam works to clean the varnish and residues so the engine can start and run strong.

Here’s what I would do: Remove as much old fuel as you can knowing that any varnish will sit at the bottom of the tank. [Don’t worry about the varnish…Sea Foam will liquefy the varnish.] Add a can of Sea Foam High Mileage to the tank, followed by a gallon of fresh fuel. [If you can’t remove some of the old gas, just add the Sea Foam and new gas to what’s there.] Start and run the engine for 10 minutes draw the Sea Foam through the carburetor circuits. Shut off the engine and let the ATV sit overnight or longer. 2 to 3 days is better. After the long cleaning soak, add another gallon of fresh gas and run the engine for 5 to 8 minutes to heat up. Then take the ATV for a short spin to create more upper engine heat and compression. Much of the Sea Foam will remain in the tank and continue to clean as you go. At that point the fuel system and fuel passageways should be very clean!

If the engine isn’t starting at the moment, follow the directions above with these slight differences:

  • Drain the fuel in the carburetor as well (it’s usually a small screw)
  • Instead of starting the engine after adding the Sea Foam, simply crank it a few times to draw the Sea Foam into the carburetor

If the engine isn’t starting because of gum or varnish in the fuel system, this will help clean it up and get it running again.

Hope that helps and let us know if there’s anything else!