Upgrade your two-stroke motorcycle with Boyesen 644 Dual-Stage Motorcycle Reeds, designed to improve throttle response, airflow, and overall engine performance. The dual-stage reed design allows faster opening and closing for more responsive power delivery across the operating range. This replacement reed set is engineered for riders seeking improved performance without extensive engine modifications.
Featuring increased velocity and flow area, Boyesen reeds help enhance low-pressure, low-throttle response for smoother acceleration and improved rideability. The durable construction is designed for longer overall service life, while the reed design helps protect the engine from damage if a reed breaks. A minor component change can provide noticeable horsepower improvements and sharper engine response.
These Boyesen part number 644 reeds fit select Yamaha YZ250 and WR250 two-stroke motorcycles, including Yamaha YZ250 models from 1990 through 1996 and Yamaha WR250 models from 1991 through 1993. Verify the motorcycle year and model before installation to ensure proper fitment. Manufacturer and vendor part number: Boyesen 644.
Features:
- Dual-stage reed design for improved engine response
- Faster opening and closing for sharper throttle performance
- Improved low-pressure and low-throttle response
- Increased velocity and flow area for enhanced airflow
- Minor upgrade designed to provide noticeable horsepower improvements
- Durable construction for longer overall service life
- Designed to help prevent engine damage if a reed breaks
- Fits select 1990-1996 Yamaha YZ250 and 1991-1993 Yamaha WR250 motorcycles
Fitment:
1990 Yamaha YZ250
1991 Yamaha WR250
1991 Yamaha YZ250
1992 Yamaha WR250
1992 Yamaha YZ250
1993 Yamaha WR250
1993 Yamaha YZ250
1994 Yamaha WR250
1994 Yamaha YZ250
1995 Yamaha WR250
1995 Yamaha YZ250
1996 Yamaha WR250
1996 Yamaha YZ250