741712 Replacement Parts Fuel Screw Washer

This genuine Mikuni fuel screw washer is a precise replacement part for the HSR45 performance carburetor. Often used on high-performance Harley-Davidson Big Twin engines, the HSR45 requires specific small hardware to maintain proper tuning and seal. This washer sits within the fuel screw assembly, ensuring the spring and O-ring function correctly to allow for accurate idle mixture adjustments. Mikuni is the industry standard for smooth-bore carburetors, known for their throttle response and reliability. Using original Mikuni hardware ensures that your carburetor maintains its factory-spec performance and prevents air leaks. This small but vital component is sold each and is necessary for any HSR45 rebuild or maintenance.