Genuine Keihin jets provide the best replacement or calibration solution for your Keihin carburetors.  Do not use an imitation, nothing substitutes for OEM quality and Keihin jetting is guaranteed to be the exact size indicated because of high manufacturing tolerances.  This Keihin fuel screw kit replaces the worn out fuel screw set on your FCR carburetor.  Includes the screw, spring, washer, and o-ring.  This fuel screw has the 6° taper.  An optional 9° taper is available as well, please inquire. 

This fuel screw kit will NOT work on the FCR-MX carburetors.