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