Home Forums 2-Cycle Racing Carbon Buildup Cleaning?

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    • #24145
      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!

    • #24429
      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.

    • #24684
      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.


      FAA certified jet engine and aircraft technician,
      Nicholson Speedway class champion 2001,
      Yamaha KT100 Service Center,
      41 years karting experience

    • #24696
      Jeremy Ellison

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

    • #26672
      Brian Spek

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

    • #26811
      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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