The Boyesen 637 is a dual-stage replacement power reed set designed for select classic Suzuki two-stroke off-road motorcycles and ATVs.

Key Details
Design: Patented dual-stage fiberglass layout featuring a lightweight, resilient top reed for partial throttle response and a stiffer, ported bottom reed for high-RPM air flow.
Material: Exclusive Dura-Flex material engineered for longer reed petal life and reduced risk of engine damage if broken.
Performance Gains: Provides crisper throttle response, quicker acceleration, and improved overall horsepower across the powerband.

Vehicle Fitment
Suzuki RM250: 1989–1990 (and 1991–1992 3-petal versions)
Suzuki RMX250 / RMX250S: 1989–1992
Suzuki LT500R QuadRacer: 1988–1990