Boyesen 642 Power Reed For: Kawasaki KX125 1994-1998; Suzuki RM125 1990-1998; Yamaha YZ125 1994-1999 Power reeds use a patented dual stage fiberglass design for more air flow, more air velocity and more power The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs; the stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs Longer overall life: Boyesen power reeds outlast all other aftermarket reed petals Minor change gives major horsepower improvements and fuel economy