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BOYESEN 603 dual-stage motorcycle reeds are designed to support responsive engine performance through faster opening and closing, greater low-pressure response, increased velocity, and greater flow area. This reed design provides a minor component change intended to deliver major horsepower improvements while also supporting longer overall service life.
The BOYESEN 603 reeds fit 1983 and 1984 Honda CR60R models; 1983, 1984, and 1985 Honda CR80R models; and 1980 through 1984 Yamaha YZ80 models. Verify the vehicle year and model before installation to confirm fitment.
Manufacturer part number: 603. Vendor part number: 603.
Features:
- Dual-stage reeds: Designed with separate stages to support responsive operation.
- Horsepower improvement potential: A minor reed change is intended to provide major horsepower improvements.
- Faster operation: Supports faster opening and closing.
- Low-pressure response: Provides greater low-throttle response.
- Increased velocity: Designed to support greater airflow velocity.
- Greater flow area: Provides a greater flow area.
- Extended life: Designed for longer overall life.
- Breakage protection: No engine damage if broken.
- Fitment: Fits 1983 and 1984 Honda CR60R, 1983 through 1985 Honda CR80R, and 1980 through 1984 Yamaha YZ80 models.
Fitment:
1975 Yamaha YZ125
1976 Yamaha YZ100
1976 Yamaha YZ125
1976 Yamaha YZ175
1977 Yamaha It175
1977 Yamaha YZ100
1977 Yamaha YZ125
1978 Yamaha It175
1978 Yamaha YZ100
1978 Yamaha YZ125
1979 Yamaha It175
1979 Yamaha YZ100
1979 Yamaha YZ125
1980 Yamaha It125
1980 Yamaha YZ100
1980 Yamaha YZ80
1981 Yamaha It125
1981 Yamaha YZ100
1981 Yamaha YZ80
1982 Honda CR80R
1982 Yamaha YZ100
1982 Yamaha YZ80
1983 Honda CR60R
1983 Honda CR80R
1983 Yamaha YZ100
1983 Yamaha YZ80
1984 Honda CR60R
1984 Honda CR80R
1984 Yamaha YZ80
1985 Honda CR80R