Description
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 to 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
643 made by Boyesen
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