FCR Carburetor Easy Air Fuel Mixture Screw For CRF150R CRF250R CRF450R CRF250X CRF450X Condition: Brand Quantity: 1x Fuel Mixture Screw Material: 6061-T6 Aluminum CNC machined screw for FCR carburetors design secures adjustment setting Numerically calibrated for tuning memory Includes spring, washer, and Anodized finishing Fitment: Fits all FCR & FCR-MX Carburetors, compatible with most common 4-stroke models. Reference fit models: CRF150R CRF150R Expert CRF250R CRF250X CRF450R CRF450X TRX450R TRX450R (Electric Start) KLX450R KX250F KX450F 250 SX-F 250 XC-F 250 XCF-W 400 XC-W 450 EXC 450 MXC 450 SX 450 SX-F 450 XC 450 XC-F 450 XC-W 505 SX-F 505 XC-F 525 EXC 525 MXC 525 SX 525 XC 530 EXC RM-Z250 RM-Z450 WR250F WR426F WR450F YFZ450 YZ250F YZ426F This part may fit other makes and models. Verify compatibility before purchase. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.