Description
Specs
Standard Features
Color

Description

250 horsepower provides dominating performance.

Kawasaki stunned the motorcycling world with the launch of its Ninja® ZX-14 flagship. It didn’t take long for the mighty ZX-14 to assume its rightful place as the quickest and fastest stock production motorcycle. Now, Kawasaki extends its high-performance domination into the realm of personal watercraft. As the quickest and most powerful production PWC in history, Kawasaki’s new JET SKI® Ultra® 250X serves notice that “ULTRA” defines the pinnacle of PWC performance.

The supercharged Ultra 250X delivers 250 horsepower for astonishing acceleration that can be felt in the rider’s soul. Once up to speed, its precise handling and superb stability are equally impressive, thanks to a brand-new hull specifically designed to capitalize on the engine’s awesome performance.

The JET SKI Ultra 250X’s new engine, jet drive and hull incorporate racing technology refined through Kawasaki’s multiple IJSBA championships. This same technology allows it to deliver the awesome acceleration of a drag racer, and help ensure excellent hook-up – even in rough water.

Specs

Manufacturer
Kawasaki
Model Year
2007
Model
Jet Ski® Ultra® 250X
Starting at MSRP
 $11,499.00*

Dimensions

Length
132.7 in.
Height
45.3 in.
Width
46.9 in.
Weight
903.8 lbs.

Engine

Engine
4-stroke, 4-cylinder in-line, DOHC, 4-valve per cylinder, water-cooled
Horsepower
250 hp @ 7,750 rpm
Displacement
1,498 cc
Bore x Stroke
83 x 69.2 mm
Compression Ratio
7.8:1
Fuel Tank Capacity
20.6 gal.
Ignition
TCBI with digital advance
Starter
Electric
Lubrication
Semi-dry sump

Drivetrain

Propulsion System
155 mm jet pump, axial-flow, single stage
Impeller
3-blade, oval-edge stainless steel
Thrust
1,524 lbs.

Body

Storage
53 gal.

Other

Colors
Sunbeam Red, Two-tone Valiant Blue / Metallic Phantom Silver

Standard Features

Engine
 Liquid-cooled 1,498 cc, in-line 4-cylinder engine is fitted with a supercharger and intercooler  
 Most powerful production PWC engine in the world  
 The 83.0 x 69.2 mm bore and stroke are the same as the JET SKI STX®-15F’s powerplant  
 Compression ratio is lowered to 7.8:1, to minimize detonation at high-boost pressures  
 Inconel exhaust valves are fitted for superior heat resistance and enhanced reliability (valve sizes are: 33.4 mm intake / 28.3 mm exhaust)  
 The engine’s over-rev capability has been raised by 700 rpm (redline is 8,900 rpm)  
 Precise power adjustments are easy with a throttle lever that is designed to prevent finger fatigue on longer rides  
Roots Type Supercharger
 The Roots type supercharger design produces large amounts of boost even at low rpm, for instant and powerful acceleration right off of idle  
 Force-feeds the engine two liters of air with every revolution, providing a stable supply of high-pressure intake air at all rpm  
 Provides a very flat and meaty torque curve with step-free power across the rev range and none of the lag associated with turbochargers  
 Produces a maximum of 11.4 psi of boost pressure  
 Produces more low RPM boost than competitive or aftermarket systems  
 To prevent over boosting at low and medium rpm, two different air bypass valves (ABV) are used  
 The smaller ABV releases low amounts of excess pressure build-up, for precise boost management  
 The larger ABV is used when excessive boost pressure is accumulated, to maintain an even intake pressure even when giving full-throttle from idle  
Air-to-Water Intercooler
 Efficiently cools the high-pressure intake air  
 Cooler air results in higher combustion efficiency and high engine output  
 Liquid-cooling allows the intercooler to maintain consistent thermal performance  
Fuel Injection
 New, high-flow fuel injectors with four orifices are fitted to complement the increased power output and improve combustion efficiency  
 Single throttle body features a large 60 mm bore diameter  
Exhaust
 The Ultra 250X features a 4-into-2-into-1 powerboat-style exhaust system, which routes the exhaust pipe upwards  
 Allows the smoothest path for exhaust gases, maximizing exhaust efficiency  
Jet Pump
 To efficiently convert the Ultra 250X’s massive horsepower into thrust, an all-new, large-diameter 155 mm jet pump was designed  
 Developed based on feedback from Kawasaki’s race machines, this pump was specially designed to deliver stable output and good “bite,” even when riding on rough water  
 The reverse lever has been moved from the right side to the left side for easier operation  
Impeller
 To suit the new 155 mm jet pump, a larger impeller was designed, offering improved thrust in the higher speed ranges  
 The sophisticated three-blade unit delivers both high performance and quiet operation  
Guide Vanes
 To suit the new jet pump, a new 8-vane intake guide is used. These guide vanes smooth and regulate the flow of water from the impeller for efficient and powerful propulsion  
 8 guide vanes provide superior “traction” compared to the older 6-vane system  
Ride Plate
 Features a groove from the center to the rear of the ride plate, to enhance straight-line stability  
Hull
 The new hull was designed based on feedback from Kawasaki’s IJSBA championship winning racing machines.  
 Specially designed to cope with the engine’s horsepower  
 Offers a combination of high stability and responsive handling in both calm and rough-water conditions  
 Delivers the neutral handling and turning characteristics that made Kawasaki JET SKI watercraft famous  
 The new super-strong hull is 250 mm longer, to ensure stable handling performance with the larger, more powerful engine  
 The lower hull is specially designed to distribute the engine and power delivery loads over a wide area  
 Although it has a similar V-shape to the JET SKI STX-15F, the Ultra 250X’s hull enables a high bank angle, for motorcycle-like turning performance. This reduces the side G-loads imposed on riders during turns  
 The V-angle at the bottom of the hull has been changed to 22.5° to help prevent spinouts during sharp turns and to provide a smoother ride in rough water  
 To avoid concentrating heavy components towards the rear, the battery is located inside the front storage area near the center of the machine. This remote location also frees up space inside the engine bay  
Bond Flange & Bumper
 The bottom of the hull slants upwards steeply from the center section to the bow, allowing the Ultra 250X to penetrate swells and waves with less shock. At low speeds the result is extreme stability; at higher speeds the Ultra 250X’s massive thrust enables the hull to push through waves rather than bounce over top of them  
Sponsons
 Newly developed sponsons extend further from the hull, providing stable straight-line performance while helping to retain the narrow hull design. They also contribute significantly to the Ultra 250X’s excellent maneuverability when changing direction (particularly at higher speeds)  
Quattro KSD
 Ridges across the bottom of the bow, Kawasaki Splash Deflectors deflect water splashing forward from under the hull. To reduce spray during high-speed turns, the earlier triple splash deflector now has one more deflector mounted at the top. Whether turning or blasting straight ahead, at high speeds or low, the Quattro KSD minimizes spray, allowing greater rider concentration and a drier ride  
Kawasaki Smart Steering/SLO-Mode
 Kawasaki Smart Steering (KSS®) is equipped to help new riders better enjoy the performance of this remarkable machine  
 Smart Learning Operation (SLO)-Mode function allows newer riders to become familiar with the handling and response of this JET SKI watercraft at a more relaxed pace before unleashing the full power of the Ultra 250X. Two separate keys (one for SLO-mode, one for full-power operation) help prevent confusion over which setting is in use  
Comfort and Convenience
 5-way adjustable handlebars allow operation while standing or sitting and are designed to suit a wide range of riders  
 Relatively narrow seat is comfortable for either stand-up or seated riding, or when riding with passengers  
 Ergonomic deck design gives plenty of legroom without necessitating a high seat, for rider-friendly seating accommodations  
 A long rear boarding step makes it easy to climb on board, and the step retracts inside the bumper to prevent damage  
 A quick and easy under hood hose connection allows nearly silent cleaning system to flush sea water out of the engine  
 Mirrors are mounted to the upper deck to facilitate opening of the hatch cover  
Capacious Storage
 The large-capacity, fully sealed 53-gallon storage area has plenty of room for recreational equipment. A detachable storage tray is also fitted  
 Mounted on the center console is a detachable drink holder with space for (2) drink bottles  
 A compact storage area is integrated with the under-seat rear grip and ideal for small items  
Increased Fuel Capacity
 Offering more fuel capacity than any machine in its class, the Ultra 250X’s 20.6-gallon fuel tank holds 3.7-gallons more than the JET SKI STX-15F watercraft  
Additional Features
 With a 1,498cc marine engine derived from Kawasaki’s astounding JET SKI STX®-15F watercraft, the Ultra 250X produces power comparable to a normally aspirated high-performance three-litre engine, thanks to the addition of a Roots-type supercharger. Unlike centrifugal superchargers or turbochargers, the Ultra 250X’s high-volume direct-drive supercharger delivers boost virtually instantly at any engine speed from idle to redline. This results in a linear, smooth torque curve which is ideal for a personal watercraft that needs to accelerate hard all the way from a standstill through astounding top-end speeds.  
 A common drawback of forced-induction is the heat build-up that occurs when the intake air is compressed. 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 JET SKI Ultra 250X’s stunning acceleration is augmented by a huge 155mm jet pump featuring the largest PWC impeller and nozzle Kawasaki has ever produced. Developed based on feedback from Kawasaki’s race machines, 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. This is a significant factor in the Ultra 250X’s mind-boggling acceleration. The new pump incorporates a groove from the center to the rear of the ride plate which makes it easier to hold a stable heading when riding in a straight line.  
 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.  
 In addition to more power and acceleration than any other production watercraft on the planet, the Ultra 250X also boasts an all-new race-developed hull. Extensive research and refinement has allowed Kawasaki to design a brand-new hull which is just as comfortable in rough conditions as in calm. Even at high speeds, rough water can do little to deter the Ultra 250X. This combination of unearthly power mated to the latest hull technology allows Kawasaki’s flagship to literally cleave through waves that would send lesser machines running for safe harbor.  
 In addition to its acceleration and top-speed capabilities, the Ultra 250X also offers precise handling and superb stability, thanks to a hull that was specifically designed to compliment the engine’s incredible output. This fiberglass reinforced plastic (FRP) hull is loaded with DNA from Kawasaki’s IJSBA championship winning machines. This includes carefully designed sponsons and chines for enhanced straight-line stability and precise cornering, combined with a 22.5° deep-V hull for a smoother ride in rough water.  
 In recognition of the tremendous power on tap, Kawasaki designed the Ultra 250X’s hull to lean into corners like a motorcycle. This helps passengers stay centered, and keeps the rider in control during peak cornering g-forces.  
 The Ultra 250X features a five-step adjustable handlebar position that allows either stand-up or sit-down riding for enhanced comfort and versatility. As Kawasaki’s flagship watercraft, the 250X includes thoughtful standard features like an enormous 53 gallon detachable front storage compartment and a 20.6 gallon fuel tank (the largest in its category) for substantial cruising range.  
 From horsepower to handling and everything in between, once the spray settles after the first ride, one thing will be certain. As the most powerful PWC on the planet, this “ultra” new JET SKI offers performance and excitement that are unmatched by any other watercraft.  
Additional Specifications:
 Maximum Boost: 11.4 psi  
 Fuel Injection: Digital fuel injection  
 Coupling: Direct drive from engine  

Color


Sunbeam Red

Two-tone Valiant Blue / Metallic Phantom Silver
*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable).
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