Factory Effex (12-36000) Mag Fuel Adjustment Screw Fits YAMAHA YZ426 00-02, YZ250F 01-09, YZ450F 03-09, WR426 01-02, WR250F 01-09, WR450F 03-09; HONDA CR150R 07-15, CRF250R/250X 04-09, CRF450R 02-08, CRF450X 05-09; KAWASAKI KX250F 04-08, KX450F 06-08, KLX450R 08; SUZUKI RMZ250 04-08, RMZ450 05-07 Fits Keihin FCR carburetors Fuel Adjustment Screw Mag This adjuster makes dialing in your carb quick and easy Made from CNC Machined 6061 for precise adjustments; Available in Red, Blue and Mag colors No tools needed to adjust