* FMS01 - Fuel Mixture Screw (Blue) : New FCR Carb

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INCLUDED WITH O-RING, WASHER AND HEAVY DUTY SPRING the new Zipty fuel screw fits Keihin Pumper Carburetors ('FCR'). It fits all YZ/WR 426F, 250F and 450F bikes, as well as the YFZ quads. It does not fit the YZ and WR 400Fs (uses FMS02). FMS01s fit all CRF450 and CRF250 Hondas, but, they do not fit the 450cc based Honda quads. They fit the new Kawasaki KX250F, and its yellow sibling, 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 bikes (uses FMS02). If the Fuel Mixture Screw collar is above the main jet access bolt, it takes an FMS01. If the collar is level with the main jet access bolt, then your carb takes an FMS02. If you own one of the modern four-stokes with the Keihin FCR carb, then you know their off-idle acceleration is tempermental when ambient conditions like temperature, humidity, and altitude change. And, you know what a pain it is to adjust the stock mixture screw on the FCR carburetor. The solution is adjustment when conditions change, and the Zip-Ty Fuel Screw allows fast and easy adjustment. The new FMS01s are carved from 7075 T7 Aluminum for improved tensile strength and have a redesigned tip taper and seating shoulder to accomodate the newest (3rd generation) Keihins. They feature a knurled forend for easy grip, anodizing for longevity, and laser etching for adjustment accuracy. The Zip-Ty Racing screw allows you to fine tune your bike easily and quickly with just your fingers - trail or track side. Specific ZTR Screw available for both models of FCR carburetor.