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BOYESEN 2004 CR250 BOYESEN RAD VALVE, BLOCK RAD-02H, RAD02H Shoulder Straps YAMAHA WR F 250 ccBoyesen Rad Valve RAD 02H RAD02H Now delivered with carbon fiber reeds for even greater performance gains Maintains flow velocity through the valve and redirects intake charge for more even distribution to the intake ports Sharper, quicker throttle response Added torque improves performance on hills, through corners and over technical jumps Increases horsepower in low , middle and especially the top end ranges One piece aluminum casting, no trimming