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

• Independently lab and rider tested

while the 3D mesh lining ensures improved air circulation and comfort

Updated side entry zipper

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.