- Boyesen's? patented dual-stage design incorporates a specially shaped top reed and a ported bottom reed
- The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs
- The stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs
- Allows replacement of stock reed stop with a Rev-Plate which permits the reeds to open freely and function efficiently
Yamaha -- YZ 250 -- (2019, 2020, 2021, 2022, 2023, 2009, 2012, 2014, 2007, 2008, 2010, 2013, 2017, 2015, 2018, 2005, 2011, 2006, 2016); Yamaha -- YZ 250 X -- (2019, 2020, 2021, 2023, 2022, 2018, 2016, 2017)
