Home Forums 2-Cycle Racing Carbon Buildup Cleaning?

This topic contains 5 replies, has 5 voices, and was last updated by  Harry Canoles 1 year, 2 months ago.

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    Jeremy Ellison

    What’s the best way to clean carbon buildup off a 2 stroke when rebuilding?

    I’m rebuilding my KT-100 and the buildup on the exhaust port came off with a little sea foam and some light brushing (synthetic bristles, not wire). The same did not work for the buildup on the head. I even soaked it overnight to no avail.

    Tips appreciated. Thanks!


    John Crider

    The easiest way is if You have a lathe or a big drill press is to get a head holding fixture that screws in the spark plug hole and the spin the head and clean it with scotch bright and carb spray. You clean it and give it a good polishing at the same time. If You don’t have a way to spin it then use carb spray and scotch bright. And wear eye protection, Carb spray burns if it gets in Your eyes.


    Walt Gifford

    DO NOT spin a head in the drill press. There is a good chance it will come flying out. Those chucks are held in with a taper not good at taking side loads or vibrations of any kind.

    You can scrape the carbon off with a small pen knife, just don’t dig in too hard or you’ll scratch the aluminum.



    Jeremy Ellison

    Thanks Gif, you may have saved me from serious injury :). I see why people run synthetics now…


    Brian Spek

    you can try spraying sea foam into the carb while running the engine. $5 at auto zone.


    Harry Canoles

    I would try. Gunk carb cleaner, ( the old dip in the tank type ).

    If that fails Glass beading.

    Like some one else mentioned Seafoam or Mercury Marine has a spray into intake while

    engine is running.  Follow Directions or else.

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