KTM EXC 300 discussion forum:

RE: Sparp Plug breakdown

RE: Sparp Plug breakdown

NN said 2003-05-05 06:42

I would look at the color of the plug when you pull it out. If it is fouled (black and covered with gunk) then you need to rejet your carb. Go down on your main jet one number at a time until you can run 1/4 mile wide open with a clean white plug.
Good luck
tom

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