Boyesen 640 Power Reed, Black

Boyesen Power Reeds use a patented dual-stage fiberglass design for more airflow, more air velocity and more overall power. This item fits the following applications: 1978-1989 Yamaha YZ250, 1983-1984 Yamaha IT490, 1982-1983 Yamaha YZ490, 1977-1983 Yamaha IT250, 1981-1982 Yamaha IT465, 1980-1981 Yamaha YZ465, 1980 Yamaha IT425, 1979 Yamaha YZ400, 1979 Yamaha IT400.

• 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
• 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
• Fit type: Vehicle Specific