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Message: [QUOTE="yam 3, post: 265527, member: 18540"] I have a 00 yz250 us model and I have a plastic looking screw that adjusts the idle and another smaller brass screw that adjusts the air screw. I would turn the metal screw out 1 1/2 turns from fully in, and then adjust the idle. If it still fouls then you might go another 1/2 turn on the air screw, but you probably need a leaner pilot jet. Before doing any of the above check the air filter to mnake sure it is clean as a dirty on will cause a rich condition. [/QUOTE]