Boyesen 603 Power Reed Fits: Honda: CR60 83-85; CR80 82-85, Suzuki: PE175 83, Yamaha: YZ80 80-84; YZ100 All; IT125 All; YZ125 75-79; IT175 through 79; YZ175 All; DT200/R 87,88,90; DT250 71-73; RT360 71-73; Tri-Moto 125 through 82 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 H.P. improvements and fuel economy