Boyesen Power Reed Dualstage Yamaha Yz125 88-92, Tri-Z 250 85-86 Ignition Cover Protectors these guys are the heavy

these guys are the heavy hitters of the pro class

· KTM 85SX 2003

CE tested and certified as impact protection: Knee EN1621-1 Hyper extension limitations 5º

SX and MXGP racing-inspired shoulder details and new brand application

Shaft is 8

Boyesen Power Reed Dualstage Yamaha Yz125 88-92, Tri-Z 250 85-86 Ignition Cover Protectors these guys are the heavyOne 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.