BOYESEN RAD VALVE 00 YZ125, BLOCK RAD-33E, RAD-33E TWIN AIR Zongshen: ZS25 250GS

Zongshen: ZS25 250GS

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BOYESEN RAD VALVE 00 YZ125, BLOCK RAD-33E, RAD-33E TWIN AIR Zongshen: ZS25 250GSBoyesen Rad Valve RAD 33E RAD33E 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