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BOYESEN 90-01 CR500 BOYESEN RAD VALVE, BLOCK RAD03A, RAD-03A, RAD03A Moto Helmets Yamaha YZ250 1999Boyesen Rad Valve RAD 03A RAD03A 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