Rejetting the carb involves getting a bigger main jet (it's a fancy screw) and replacing the old one if it's necessary. But first try just adjusting the mixture and the needle clip if necessary after you change the filter. The important thing is that your fuel/air mixture is right, so go as far as you have to in order to do that. First try adjusting the mixture screw and the needle clip, and then if it's still to lean, rejet. I hope that made sense
-Aaron
It ain't no fun unless you kin git hurt doin it.
Rides: YTM-225DX, 2x YTM-175, KLT-160, ATC-125M, ATC-250SX, ATC-200x, ATC-200E