Boyesen 644 Boyesen Power Reeds Yamaha Dirt Bike Yamaha-FZ-1-2013 Part Number: 46839

Part Number: 46839

The dash rocker also comes with a blue led light inside to light up your dash at night

2018 Arctic Cat Alterra 700 4X4 VLX

2013-2021 Polaris Indy 600 SP 129in

Boyesen 644 Boyesen Power Reeds Yamaha Dirt Bike Yamaha-FZ-1-2013 Part Number: 46839Boyesens 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. Boyesens 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 cant possibly duplicate that performance. Dual stage reeds Minor change gives major H. P. improvements Faster opening and closing