If you ride a Kawasaki Ultra 300 or 310, you know the feeling: long, wide-open runs, cruising for hours, or pinning it hard at full throttle, and the last thing you want to worry about is your supercharger belt. Yet one soft, slip-prone belt can turn a perfect day on the water into a long tow back to shore. Kawasaki’s recent shift to softer, automotive-style OEM belts has left some riders frustrated, and while cheaper aftermarket belts exist, they still fall short under sustained load. That’s where Kawi Performance steps in. Their new High Modulus Supercharger Belt isn’t just a replacement — it’s a return to the kind of reliability and durability that serious riders have been missing. Stiff, textured, and engineered to resist water, oil, and heat, this belt is built to handle the Ultra’s most extreme conditions without compromise.
Even seasoned Ultra riders might not realize how much the belt itself has changed over the years. Kawasaki’s new OEM belts, made overseas with softer, automotive-style backing, simply aren’t built for extended rides or sustained throttle. On long cruises or full-throttle blasts, they can stretch, slip, or degrade faster than riders expect — leaving you stranded when you least want it. Standard aftermarket options improve on price, but they often lack the stiffness, textured grip, and water-resistant design needed to handle the Ultra’s extreme conditions without compromise.
That’s why Kawi Performance’s High Modulus Supercharger Belt is such a game-changer. Drawing on the same design used on Kawasaki’s Ultra 250/260 models, this belt is engineered for real-world reliability. The textured outer layer grips like it should, high-tensile chords keep it from stretching, and its oil- and water-resistant inner rib ensures maximum traction even under constant load. The result is a belt that can handle hundreds of hours of riding, whether you’re hammering the throttle or logging long, steady runs, giving riders confidence that their day on the water won’t end in an unexpected tow.
Kawi Performance has been in the game long enough to understand what riders really need. Since the early Ultra 250/260 days, high-modulus belts were the standard for anti-slip, oil- and water-resistant performance. Riders pushing those machines knew that belt failure wasn’t just an annoyance — it could ruin a ride or a race. The new High Modulus belt brings that same engineering to the 300/310 platform, blending tried-and-true design with modern materials built to withstand today’s extended rides and higher demands.
For riders who like to push their Ultra to the limit, whether on a full-throttle sprint or hours of open-water cruising, the belt’s stiff, textured construction keeps power delivery smooth and reliable. It’s engineered to resist stretching, slipping, or degrading even under heat, water, and oil exposure.
Right now, Kawi Performance is making it even easier to upgrade: the High Modulus Supercharger Belt is on sale for $135 (originally $149.99). While the new OEM and standard aftermarket belts are still available, riders serious about reliability, longevity, and peace of mind know there’s only one belt engineered to handle the Ultra’s full potential. Quantities are limited, and once these belts are gone, it’s uncertain when — or if — more will be available, making now the ideal time to secure one for your ride.
