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problem with my 1989 cr250

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i have a 89 cr250 , my problem is the bike starts and idles fine then after you let it warm up you go to open it up and ride it and the bike will backfire and bog wen you give it gas , im pretty lost on wat it could be and i also have carbon build up in the exgaust and in the power vavles the carbon build up is more like a wet carbon build up . Any ideas would be helfull thanks

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Clean the carb and blow out each jet with a can of compressed air ? Start there, and see how it runs after.

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Probably wouldn't hurt anything to clean the powervalve and repack the silencer as well. At least to give you a clean slate to work with.

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