Boyesen 602 Power Reed For: KTM 125 through 1983; Rotax 125 case reed all models; Suzuki DS100 all models, DS125 all models, DS185 all models, DS250 all models, PE250 through 1979, RM100 through 1978, RM125 through 1978 For: RM250 through 1978, TS100 all models, TS125 all models, TS185 1981, TS250 through 1981, TS50 all models, RM370 and RM400 through 1978 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 Power reeds use a patented dual stage fiberglass design for more air flow, more air velocity and more power; minor change gives major horsepower improvements and fuel economy