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why is my rear fender black?

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I'm new to thumpers, have a 95 klx 250 with a 300 big bore kit on it. It juts recently started to leave a black residue on my rear fender from the exhaust, what does that mean? burning oil? what needs to be done to fix it.?

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May be burning rich. Take a look at your plug. My bike gets a little soot after a few rides on the rear fender, but the bike is running well (not lean or rich) and burns no oil. I just clean it off! :applause:

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I'm going to check the plug first thing tomorrow. I rode for maybe two hours and the fender is black? The bike is running better then ever thou...

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