2011 Kawasaki Jet Ski Ultra 300X Supercharger 3 passengers 1500cc Only 41 Hrs
Three-hundred horsepower once again makes the Ultra the undisputed horsepower king in the PWC market. A new Eaton TVS supercharger design carries the lion’s share of the load. According to Kawi engineers, the previous design produced power more in waves. The new supercharger’s twin, four-lobe rotor design promises to deliver a more consistent flow of air throughout the powerband, smoothing throttle response while boosting performance.
The stats are certainly better. Torque has increased from 177.2 ft-lbs to 201; max thrust has gone from 1585 lbs to 1829; and boost pressure now sits at 17.3 psi compared to the former’s 11. Weight has also been reduced, with about 44 pounds trimmed from the boat’s previous girth. Big enhancements all, and ones you can feel in the craft’s acceleration. While I wasn’t able to measure 0-30mph times during our mostly open-waters test ride at the press intro, acceleration feels indeed stronger from a seat-of-the-pants perspective. Top speed is limited to 67 mph to appease the U.S. Coast Guard, but there’s little doubt the craft will do better.