Boyesen Power Reed Dualstage Yamaha Yz250 97-98 Air Filter Accessories Hand openings behind each front

Hand openings behind each front pocket for access to your trouser pockets

SE-R/SE-F 16-23

Optimal AirLine back ventilation

350F FREE-RIDE 14-20

Reduced Material Volume - The design also reduces the Tech 10’s profile and physical size

Boyesen Power Reed Dualstage Yamaha Yz250 97-98 Air Filter Accessories Hand openings behind each frontOne 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.