86-85 CR250R BOYESEN RAD VALVE TRX250R, BLOCK RAD04A, RAD-04A, RAD-04A
Boyesen Rad Valve RAD-04A. Features carbon fiber reeds for increased performance. Maintains flow velocity and redirects intake charge for even distribution to intake ports, resulting in sharper, quicker throttle response and added torque for improved performance on hills, through corners, and over technical jumps. Increases horsepower in low, middle, and top-end ranges. One-piece aluminum casting requires no trimming or plastic inserts.
- SKU
- 05-R04A
- Brand
- Boyesen
- Availability
- In Stock (2)
FULL DESCRIPTION
Boyesen Rad Valve Intake System
The Boyesen Rad Valve is engineered to significantly enhance your motorcycle's engine performance. This advanced intake system is designed to optimize the flow of the intake charge, ensuring more even distribution to the intake ports. This results in a sharper and quicker throttle response, providing a more connected feel between the rider and the machine.
Experience a noticeable increase in torque, which is crucial for tackling hills, navigating corners with confidence, and powering through technical jumps. The Boyesen Rad Valve is proven to boost horsepower across the entire RPM range, from low-end grunt to mid-range power and especially in the top-end.
Key Features:
- Now delivered with premium carbon fiber reeds for enhanced performance gains.
- Maintains optimal flow velocity through the valve.
- Redirects intake charge for superior distribution to intake ports.
- Delivers a sharper, quicker throttle response.
- Adds torque, improving performance in various riding conditions.
- Increases horsepower in low-, middle-, and top-end ranges.
- Features a robust one-piece aluminum casting construction.
- No trimming or plastic inserts are required for installation.


