Tusk Fuel Mixture ScrewYAMAHA YFZ 450 2004-2009- 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.