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400EX jetting

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My wife just started racing GPs and some tracks have a lot of mud. I was thinking of putting the air box lid back on and was wondering which way to go on the main. Currenty it has the K&N kit with the DMC Alien full exhaust , Big Gun rev box and the air box is off. Its jetted with 170 main and fuel screw out 3.5. Any info greatly appreciated. GPs are run in Cali.,high desert stuff and the bike is a 2001.

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