All Years Gas Gas 250 Dirt Bike V-Force Delta 3 Reed Valves A Larger Flow Potential Provides Better Acceleration and More Horsepower Throughout the Powerband Crisp Throttle Response Out of the Corners Composite Material with Rubber Overmold Reed Cages Provide Longer Reed Life 12-Petal Design with Carbon Fiber Reed Petals and Adjustable Reed Stops Compatibility: All Years- Gas Gas 250