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BOYESEN RAD VALVE 01-03 KX250, BLOCK RAD-12H, RAD12H blue Factory Racing Silver/Black Vein IgnitionBoyesen Rad Valve RAD 12H RAD12H 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