Tusk Fuel Mixture Screw HONDA KAWASAKI KTM POLARIS SUZUKI YAMAHA Replaces the stock fuel screw that is difficult to adjust. Easy grip knob with laser etched numbers for simple and accurate adjustments. Comes complete with new fuel screw spring, washer, and O-ring. Machined from 6061-T6 aluminum. Fits most Keihin FCR Carburetors.