Carburetor Air Fuel Mixture Screw: The FCR carburetor mixture screw features an O-ring design to resist engine vibration and increase accuracy and longevity. The surface paint of the carburetor adjustment screw improves its corrosion and rust resistance. Prevents fading and rust. Easy to adjust and tune: With the fuel mixture screw, you can easily adjust the idle mixture without burning your hands or fumbling with a small screwdriver. Digitally calibrated to adjust memory. Easily adjust the air-fuel mixture with this screw. Carburetor Air Fuel Mixture Screw: The carburetor mixture screw fits perfectly for Honda Suzuki (reference models as follows). Perfect match with your motorcycle. Smooth and bright color. Unique appearance. Premium aluminum material: This carburetor fuel mixture screw FCR is made of premium aluminum material. Robust. Aging and abrasion resistant. To ensure maximum strength and durability for long-term use. Premium quality: The adjustment screw comes with spring, washer and O-ring. It is easy to install and replace. Simplifies the installation steps. No modification. Cutting or drilling required; Size: 57 13 mm/2.2 0.5 inches