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Boost your two-stroke’s acceleration and top-end with the Boyesen Rad Valve. Designed for maximum intake efficiency, its Aerodynamic Surface Optimization, model-specific Reed Petal Tensioning, and Multi-Stage Reed Timing deliver sharper throttle, cleaner burn, and real horsepower gains. Built from fuel-resistant composites to withstand today’s pump and race fuels.
Precision-matched applications for Yamaha YZ250/250X, KTM 65 SX, and Kawasaki KX85/100. Each Rad Valve is tuned by model, year, and displacement for optimal flow velocity and durability.
From holeshots to hill climbs, the Boyesen Rad Valve provides crisp, predictable power and proven reliability—engineered specifically for your bike.
Ideal for: MX, off-road, enduro, and track-day riders seeking a durable, bolt-on intake upgrade that delivers immediate performance gains.