Boyesen Power Reeds - 640

Improves throttle response and fuel economy, enhances acceleration and top-end speed

Revolutionary dual-stage reeds outperform and outlast any stock reed

Yamaha

IT250 1977 - 1983

IT400 1979

IT425 1980

IT465 1981 - 1982

IT490 1983 - 1984

YZ250 1978 - 1989

YZ250WR 1989

YZ400 1979

YZ465 1980 - 1981

YZ490 1982 - 1983

Part No. 05-640