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fouling plugs. 2001 yz250f

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hello i keep fowling plugs. i 90% sure its the carb. its a 01 yz259f and has trouble idling, back fires and and caughs and farts when tooting along at constant steady throttle. but only recently has it started fouling plugs. i think some thing is blocked. what could it be? how could a make it leaner. i know how to work on the carb but i dont know what to clean or what change. last time on a different bike i had a piece paper telling what jets to use and where to put the clip. any help is appreciated

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