Boyesen Power Reed Dualstage Yamaha Yz250 90-96 GPX 4.5 125-300 SX 04-25

125-300 SX 04-25

Kawasaki KX125 89-94 rear

YFZ 450R ATV 14-17

Injected Carbon Composite Frame

EX450F 21-22

Boyesen Power Reed Dualstage Yamaha Yz250 90-96 GPX 4.5 125-300 SX 04-25One 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.