Boyesen Power Reed Trial Sherco 2T St125 10-15, St200 10-14 Backpacks and High Tensions (HT) work

and High Tensions (HT) work better for long straights and wide open tracks

Fitments: YAMAHA 1991-1992 YZ125/YZ250

UFO Chain Guide (Black) Gas Gas MC85 21-24

KTM 530 EXC-F Six Days 2009-2012

Boyesen Power Reed Trial Sherco 2T St125 10-15, St200 10-14 Backpacks and High Tensions (HT) workOne 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.