Boyesen Power Reed Dualstage Yamaha Yz250 78-82 + 89 3 The inner tube is manufactured

The inner tube is manufactured from an ultra high strength 7010 T6 aluminium which is hard anodised

Manufactured from high quality T7009-T6 aluminium

Pro Circuit Clutch Springs will increase the clutch life

Dimension - 21

CRF450R 17-23

Boyesen Power Reed Dualstage Yamaha Yz250 78-82 + 89 3 The inner tube is manufacturedOne reed petal is NOT enough! Boyesen's revolutionary dual stage reed design delivers more usable power than stock. Stock single stage reeds operate most effectively within a relatively narrow RPM range and are limited because of the single stage design. Boyesen's one soft reed on top of one firm flow through reed gives you a wide range of intake control, plus increased intake velocity. Your original reeds can't possibly duplicate that performance.