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For Yamaha- Boyesen’s hot RAD valves ratchet up your torque
- Specially-designed reed cage holds Boyesen’s patented dual-stage reeds
- Maintain flow velocity through the valve and redirect intake charge for more even distribution to intake ports
- Provide quicker, sharper throttle response and more horsepower throughout rpm range
- One-piece cast aluminum bolts in easily
- Order one set per cylinder
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