Upgrade your two-stroke engine with Boyesen 609 dual-stage motorcycle reeds, designed to improve throttle response, airflow, and overall engine performance. These replacement reeds use a dual-stage design that helps the engine respond more quickly across the powerband while supporting stronger low-pressure, low-throttle performance. The result is smoother acceleration and improved rideability for trail and motocross applications.
Boyesen 609 reeds are engineered to open and close faster than conventional reed designs, helping increase intake velocity and available flow area. This performance-focused construction can provide noticeable horsepower gains with a relatively minor engine modification. The reeds are also designed for extended service life and offer added protection against engine damage if a reed breaks, making them a practical choice for performance-minded riders.
These Boyesen motorcycle reeds are intended for fitment on select Yamaha two-stroke models, including the 1980–1984 Yamaha IT175, 1984–1986 Yamaha IT200, and 1984–1986 Yamaha YZ125. Verify the motorcycle model and year before installation to ensure proper compatibility. Manufacturer part number 609 and vendor part number 609 identify this replacement reed component.
Features:
- Dual-stage reed design supports improved engine response and performance
- Faster opening and closing helps optimize intake operation
- Increased velocity and flow area can improve horsepower and acceleration
- Improved low-pressure, low-throttle response for smoother riding
- Durable construction provides longer overall service life
- Designed to help prevent engine damage if a reed breaks
- Fits select Yamaha IT175, IT200, and YZ125 two-stroke motorcycles
- Brand: Boyesen
- Manufacturer part number: 609
- Vendor part number: 609
Fitment:
1980 Yamaha It175
1980 Yamaha YZ125
1981 Yamaha It175
1981 Yamaha YZ125
1982 Yamaha It175
1982 Yamaha YZ125
1983 Yamaha It175
1983 Yamaha YZ125
1984 Yamaha It200
1984 Yamaha YZ125
1985 Yamaha It200
1985 Yamaha YZ125
1986 Yamaha It200
1986 Yamaha YZ125
1987 Yamaha YZ125
1993 Yamaha YZ125