Jetski 2007 Kawasaki Ultra 250 Only 109 Hours

The Ultra 250X has a supercharged and intercooled four-stroke, DOHC, four valves per cylinder, inline four-cylinder that delivers 250 hp for astonishing acceleration. The engine, jet drive and hull incorporate racing technology that allows it to deliver the awesome acceleration of a drag racer, and help ensure excellent hook-up – even in rough water. With a 1,498cc marine engine the Ultra 250X produces power comparable to a normally aspirated high-performance three-liter engine, thanks to the addition of a Roots-type supercharger. The Ultra 250X overcomes this with the use of a large-capacity intercooler. The 250X’s supercharger compresses the air to a maximum boost pressure of 11.4psi.

This compression heats the intake charge to extremely-high temperatures, which could limit the engine’s power output. However, the 250X’s large-capacity intercooler cools the intake charge back down to ambient temperature or even less – ideal for producing maximum power. The stunning acceleration of the Kawasaki Ultra 250X is augmented by a huge 155mm jet pump featuring the largest PWC impeller and nozzle Kawasaki has ever produced. This pump was specially designed to deliver predictable thrust and good “traction,” even when riding on rough water. The pump uses eight guide vanes (instead of the six used on previous models) to regulate the flow of water from the impeller for efficient and powerful propulsion.

To suit the 155mm jet pump a new, larger impeller was designed, offering improved “bite” in the higher speed ranges. The sophisticated three-blade design not only delivers high performance, but also provides smooth and quiet operation.