1990-1996 Yamaha YZ250, 1990 YZ250WR Power Reeds Boyesen 644

Boyesen’s revolutionary dual-stage reed design delivers more
usable power than stock. Your original one-stage reed operates most effectively only within a narrow RPM range. 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.

• Dual stage reeds
• Minor change gives major H.P. improvements
• Faster opening and closing
• Greater low pressure (Low-throttle) response
• Greater velocity and flow area
• Longer overall life
• No engine damage if broken
• Carbon pro has new carbon fiber reed for quicker response

- Yamaha