Boyesen 2-Stroke 11F Rad Valve for Kawasaki KX125 1999 An aero-form reed valve that corrects the problems associated with existing reed valve designs Maintains flow velocity through the valve and re-directs the intake charge for even distribution to the intake ports Provides quicker, sharper throttle response and more horsepower 1-piece aluminum casting; no manifolds to trim or plastic pieces to insert Boyesen Pro Series RAD Reeds included