Magnum Fuel / Air Mixture Screw
Fits Keihin Pumper Carburetors ('FCR').  This part fits all YZ/WR 426F, 250F and 450F bikes, as well as the YFZ quads, TRX450R, CRF450 and CRF250 Hondas. They fit the new Kawasaki KX250F, and its brother, the Suzuki RM-Z 250. They fit 03 and newer KTM 'RFS' 4-strokes - 450 and 525. It will not fit 02 and older KTM 400 and 520