Boyesen Power Reed Dualstage Yamaha Dt250 78-79, Dt400 77-78, Ty250 74-77+84 & 88, Ty350 85-86 Rear Fenders · Honda CRF150F / CRF230F

· Honda CRF150F / CRF230F 2008

a refined ventilation system combining front

Bike Year  Pitch Part Number KX 250 02-05 520 FXFS 23-13  KX 250 02-08 520 FXFS 23-13  KX 250 99-01 520 FXFS 23-14  KXF 450 06-20 520 FXFS 23-13

Clean around the swing arm making sure clean and free of debris

Remove your old oil plug

Boyesen Power Reed Dualstage Yamaha Dt250 78-79, Dt400 77-78, Ty250 74-77+84 & 88, Ty350 85-86 Rear Fenders · Honda CRF150F / CRF230FOne 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.