FIR Adjuster Air Screw Keihin Fcr, Fuel Mixture Screw Red

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HONDACRF/CRX 150/250/450 YAMAHAYZF/WRF 250/426/450 & YFZ QuadKAWASAKIKXF250/450/KLX450RSUZUKIRM250Z/450ZKTM 250/450/525 03-08 Fuel mixture screw RED, incl spring and seals KEIHIN A must for all four strokes using the Keihin FCR carb. To get the best throttle response from your engine you must properly adjust the low speed fuel mixture screw. Due to the difficulty of adjusting the stock screw. Mino has designed a billet extended fuel mixture screw that can be adjusted by hand. Manufactured to the exact tolerances of the stock screw with a built in thumb wheel for easy adjustments.KITS INCLUES SPRING W/ O-RING X 2PC , SPRING X 1PC , WASHER X 2PC. Part No. 18-002.DR.RD FIR [FACTORY IMAGE RACING] Cross reference numbers ONLY. MX-07014RD Show more