Boyesen Power Reed Dualstage Yamaha Rd250/350/400 Mud Deflector KTM 450 XC-F 21

KTM 450 XC-F 21

FX 350 17-23

KTM 250 EXC 2003

Size guide The measure indicated refers to the circumference of the head

Boyesen Power Reed Dualstage Yamaha Rd250/350/400 Mud Deflector KTM 450 XC-F 21One 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.