Boyesen Power Reed Dualstage Yamaha Dt250 78-79, Dt400 77-78, Ty250 74-77+84 & 88, Ty350 85-86 Engine Service Perfect combination of durable

Perfect combination of durable

RFX Factory Kit KTM EXC250 14-19 EXC250/300 TPI 18-22 EXCF250/350/450 14-22

FC 350 19-22

Gas Gas EC125 00-06 front

KTM 150 SX 2013-On>

Boyesen Power Reed Dualstage Yamaha Dt250 78-79, Dt400 77-78, Ty250 74-77+84 & 88, Ty350 85-86 Engine Service Perfect combination of durableOne 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.