Boyesen 643; Motorcycle Power Reeds

• Offers maximum performance
• Made with Boyesen's patented dual stage fiberglass design for more airflow delivering more usable power than stock reeds
• Manufactured with Boyesen's exclusive DURA *FLEX material
• Your original one stage reed operates most effectively only within a narrow RPM range while 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
• Minor change gives major H.P. improvements
• Top reed opens at lower RPMs allowing for more air and fuel flow giving you better throttle response
• Bottom reed opens at higher RPMs for maximum flow
• Faster opening and closing
• Greater low pressure (low throttle) response
• Greater velocity and flow area
• No engine damage if broken
• Longer overall life
• Matched to O.E.M specs
• More air velocity equals more overall power

Note: Two sets required for part number 304-0645. Image for reference only. Actual product may vary according to vehicle.