Boyesen Power Reed Dualstage Yamaha Yz125 88-92, Tri-Z 250 85-86 Ignition Cover Protectors CE tested and certified as

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

these guys are the heavy hitters of the pro class

Shaft is 8

• Independently lab and rider tested

Boyesen Power Reed Dualstage Yamaha Yz125 88-92, Tri-Z 250 85-86 Ignition Cover Protectors CE tested and certified asOne 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.