Boyesen

Boyesen: Over 50 Years of Powersports Performance Innovation

Few names carry as much weight in the world of powersports performance as Boyesen. Founded in 1972 by Eyvind Boyesen out of Lenhartsville, Pennsylvania, the brand was born from a single patent and a relentless drive to outperform the competition. Eyvind's patented dual-stage reed induction technology transformed how two-stroke engines breathed, and the results spoke for themselves — motorcycles equipped with Boyesen reeds began consistently outrunning those running any other intake induction system, on the track and off it.

What started as a focused pursuit of reed induction excellence quickly grew into something much larger. Reeds and reed valves remain the cornerstone of Boyesen's identity, but the brand has since expanded its engineering mastery to cover the full cooling circuit. Today, Boyesen's product lineup spans dirt bikes, ATVs, snowmobiles, watercraft, and outboard marine engines — a testament to the versatility of their engineering philosophy.

Engineering That Earns Trust at the Highest Levels

Boyesen's reputation isn't built on marketing alone. Major OEM manufacturers including Kawasaki and Yamaha have integrated Boyesen technology directly into factory racing machines, and elite riders like Chad Reed, Bob Hannah, and John Dowd have relied on Boyesen components as part of their winning strategy. That level of endorsement from both factories and world-class athletes reflects a standard of quality that goes well beyond the typical aftermarket part.

The brand's engine water pumps exemplify this philosophy. The famous Boyesen SuperCooler line uses investment-cast aluminum construction, hydrodynamically optimized impellers, and enlarged coolant passages to push more fluid through the system at every RPM range — keeping high-revving engines cooler and protecting heat-sensitive components from premature wear. Testing by Team Kawasaki confirmed meaningful reductions in operating temperatures with the SuperCooler installed.

For riders who want a complete cooling system upgrade, Boyesen's water pump components and engine water pump kits offer bundled solutions that include everything needed for a bolt-on installation — same footprint as stock, no special gaskets required. And for those targeting a more targeted upgrade, a standalone engine water pump impeller — featuring Boyesen's signature patented Nautilus-style design — delivers measurable gains in coolant flow and hydrodynamic efficiency on its own.

Built for Racers, Trusted by Enthusiasts

Whether you're a weekend trail rider looking for more reliable cooling or a competitive motocross racer chasing every last horsepower, Boyesen's approach to product development is the same: hands-on R&D, field testing, and real feedback from end users. The result is a catalog of parts that genuinely performs, and a brand that has earned the trust of riders on all six continents for over five decades.