BOYESEN Radiator Valve - YZ250 '89-'94 RAD-34A 100 percent IVS (Integrated Ventilation System) with

IVS (Integrated Ventilation System) with wide ducts hollowed into the EPS shell optimized in wind tunnel testing

2 independent charging stations

Back compartment can accommodate the Nucleon back inserts (available as an accessory upgrade)

Minimal frame design works in union with distinct lens shape to increase visibility

Soak in water for 10 minutes to activate the cooling crystals

BOYESEN Radiator Valve - YZ250 '89-'94 RAD-34A 100 percent IVS (Integrated Ventilation System) withRadiator Valve YZ250 '89 '94 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, Specially designed reed cage holds Boyesen's patented dual stage reeds, Boyesen's hot RAD valves ratchet up your torque, One piece cast aluminum bolts in easily, Order one set per cylinder