Boyesen PRO-44 Pro Series Reed For: Honda CR250 1978-1987; Honda CR450 all models; Honda CR480 all models; Kawasaki KDX200/220 all models; Suzuki RM250 1987-1988 For: Honda Pilot 1989; Honda ATC250R 1981-1986; Honda 250 FourTrax 1986-1989; Honda 350 Odyssey all models; Polaris 300/350/400 2-stroke all models The top carbon 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 Offers a quick and accurate reaction to piston speed for smooth dependable throttle response Pro series reeds use a carbon fiber top reed coupled with a durable fiberglass or epoxy bottom reed; increases performance without sacrificing the life of the reeds