The Kawasaki Ultra 300LX boasts the powerful new 300hp variant of Kawasaki’s 1498cc engine. It has a supercharger and intercooler like the previous model, but Kawasaki has replaced the supercharger design with an Eaton Twin Vortices model. The old supercharger produced surges of power. The new design has twin counter-rotating lobes which deliver the power in a steadier, continuous flow. This, together with other modifications, results in nearly 25 more pounds of torque, about 250 more pounds of thrust, and a boost pressure increase to 17.3 psi from the previous 11.

The Kawasaki Jet Ski STX-15F personal watercraft provides the precise handling and awe-inspiring acceleration demanded by serious enthusiasts. It also provides the comfort and convenience features for families who want the highest quality three-passenger watercraft.

Engine - With a high-performance four-stroke engine from the legendary Kawasaki Ninja motorcycle line as its foundation, the STX-15F delivers the kind of performance expected from a Kawasaki jet ski watercraft. A smooth spread of power across the entire rpm range thanks the flat torque curve out of the long-stroke, 1,498cc engine ensures plenty of good times. Dual overhead cams, four valves per cylinder, fuel injection and electronic engine control – to harmonize the fuel and ignition systems – provide maximum performance and reliability. A four-injector fuel injection system combined with a large 60mm throttle body deliver a quick response.

Refined as it is clean-running, the STX-15F’s four-stroke engine is rubber-mounted in the hull, the performance-tuned exhaust system is water-jacketed, and it has dual mufflers and a large-capacity airbox.

The STX-15F features Kawasaki’s innovative electronic Smart Learning Operation (SLO). Accessible directly on the instrument panel, SLO can be programmed to place a limit on maximum engine speed so novice riders can experience riding at a reduced speed as they master proper riding techniques.

Also fitted to every STX-15F is the Kawasaki Smart Steering (KSS). KSS features an on-board microprocessor that is electronically linked to a steering sensor. When the handlebar is fully turned in both direction and the engine rpm drops from a designated rpm—as when the throttle is released at speed—the microprocessor activates the system, which raises engine rpm to provide enough thrust to initiate the desired turn.

The spacious rear deck of the STX-15F makes it easy to get into water skis or on a wakeboard. An automatically retracting boarding step located on the rear of the hull simplifies reboarding in deep water. There is no shortage of space to stow items on the STX-15F. The rear deck can accommodate items needed for a day on the water, like a cooler, along with a water-resistant storage space, an easily accessible glove box and additional room for gear located under the seat.

Other features include a LCD instrument panel with fuel level, speed, engine rpm, trip distance and time information available. Fuel capacity is a generous 16.4 gallons, for extended rides. Warning lamps alert the rider to a low fuel level or high engine temperature, and a magnetic keyed ignition switch helps deter unauthorized operation.