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For: Yamaha IT250 all models; Yamaha IT400 1979-1985; Yamaha IT425 1979-1985; Yamaha IT465 1979-1985; Yamaha IT490 1979-1985 For: Yamaha WR250 1989; Yamaha YZ250 1978-1982; Yamaha YZ250 1989; Yamaha YZ400 1979; Yamaha YZ465 all models; Yamaha YZ490 1982-1983 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 International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.