2013 Ultra 300X

The Fastest Jet Ski on the Planet 

As an innovator of the personal watercraft since the first Jet Ski, Kawasaki has a long history of high performance on the water.Kawasaki's flagship, the Jet Ski Ultra 300X, pushes the performance envelope even further.

With incredible boost from an Eaton Twin Vortices Supercharger, the big Kawasaki Ninja-inspired marine engine pumps out 300 horsepower* through an all new pump for incredible hook-up and acceleration.

Not only is the Ultra 300X high powered, but it's also high-tech. Riders can adjust hull attitude with the electric trim system, there's an electronic throttle valve with electronic cruise control, fuel saving ECO mode and an all digital instrument panel.

* Measured in PS at the crankshaft under controlled conditions. Actual performance may vary.


Extended Cruising Range

Offering more fuel capacity than any machine in its class, the Ultra 300X’s 78-litre fuel tank holds 14 litres more than the JET SKI STX-15F, making long distance cruising even more accessible and inviting.


The Ultra 300X features a 4-into-2-into-1 powerboat-style exhaust system, which routes the exhaust pipe upwards. This allows the smoothest flow for exhaust gases, maximising exhaust efficiency.


Fuel Injected

High-flow fuel injectors with 4 orifices are fitted to complement the increased power output and to improve combustion efficiency. A single throttle body is used with a bore diameter of 60 mm.


New Impeller

To suit the new 160 mm jet pump, the Ultra 300X gets a new impeller redesigned to efficiently convert all the extra power into forward thrust.


New Race Bred Hull Design

Designed using feedback from Kawasaki's IJSBA Championship winning machines, the new hull now features two separate flush ports for the engine and intercooler and offers the industry's best stability responsive handling in calm and rough water. Deep 22.5 degree V-angle at the bottom of the hull provides better "grip" for racing like performance.


Jet Pump

To effectively convert the 300 PS output into thrust, the Ultra 300X utilises a new, larger 160mm jet pump, designed using eight guide vanes. The pump delivers superior “traction” in rough water conditions and significantly contributes to the Ultra 300X’s mind-boggling acceleration.


Pressurising the intake air heats it to extremely high temperatures which would rob power, but the liquid-cooled intercooler reduces intake air to ambient temperature, or even less, for higher combustion efficiency and more power.


Adjustable Handlebars

The handlebars are 5-way adjustable and suit a wide range of riders and riding styles and allows comfortable stand-up or seated riding positions. The redesigned left side reverse control is even easier to use.


Electronic Trim Control System

Electronic Trim Control System allows the rider to control the angle of the jet pump nozzle to suit water surface conditions and riding style.


Electronic Throttle Valve

The Electronic Throttle Valve operated by the thumb throttle on the handlebar makes throttle action very light for reduced rider fatigue and the more precise throttle control results in better performance, smoother running and increased fuel economy.


Large Capacity Storage

The huge 200 litre front storage compartment comes with removable tray. There's also a centre console storage area with large  enough space for two water bottles.

Kawasaki Smart Steering

Designed to assist inexperienced riders, the Kawasaki Smart Steering system is electronically linked to an on-board microprocessor and automatically adjusts engine speed and thrust while cornering to ensure a smooth, controlled turn.

Multiple Riding Modes

The ECU controlled ETV allows multiple riding mode options to be activated with the touch of a button. 8 kph mode conveniently regulates rpm to maintain constant speed in no-wake zones and cruise control fixes speed at a specified level for convenient long distance touring.



The Ultra 300X’s liquid-cooled 1,498 cm3, In-line 4-cylinder engine got new pistons, cam shaft and conrods in 2011. The TVS Eaton supercharger uses twin four-lobe rotors to produce a continuos delivery of air, giving the Ultra 300X an output of 300 PS reclaiming the title as the most powerful production PWC in the world.


All New Instrument Panel

The LCD screen is easy to read and also displays water and air temperature in addition to the speedometer, tachometer, hour meter, clock, trip distance, trip time and fuel level. It is also positioned higher on the hull with a revised visor for improved visibility.


Beginner Friendly

The Ultra 300X features Kawasaki’s innovative electronic Smart Learning Operation (SLO) system which can be programmed to speed-limit the engine to assist novice riders in mastering their riding technique without worrying about excessive speeds.


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Type Supercharged Intercooled, 4-stroke In-Line Four
Displacement 1,498 cm3
Bore and Stroke 83 x 69.2 mm
Compression ratio 8.4:1
Valve system DOHC, 16 valves
Fuel system Fuel injection: ø60 mm x 1
Ignition TCBI with Digital Advance
Starting Electric
Cooling Inducted water
Lubrication Forced lubrication, semi-dry sump

Drive System

Coupling Direct drive from engine
  Type Axial flow, single stage
  Thrust 8,136 N {829.6 kgf}
  Impeller diameter ø160
Steering Steerable nozzle


Maximum power 221 kW {300 PS} / 7,750 rpm
Maximum torque 272 N.m / 7,250 rpm


Overall length 3,370 mm
Overall width 1,195 mm
Overall height 1,150 mm
Curb mass 462 kg includes full tank of fuel
Fuel capacity 78 litres

The specifications mentioned here apply to and have been achieved by production models under standard operating conditions. We intend only to give a fair description of the vehicle and its performance capabilities but these specifications may not apply to every machine supplied for sale. Kawasaki Heavy Industries, Ltd. reserves the right to alter specifications without prior notice. Equipment illustrated and specifications may vary to meet individual markets.

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Accessories for JT1500HDF 2013 ULTRA 300X


W99993033 More info Find a Dealer

* Weighs 3.5 lbs * Holds in mud, sand, gravel and rock * Folding anchor has powder-coat finish & comes with padded nylon storage case * Fits in most PWC's storage compartments * Includes 25' of rope, buoy & giant hook


W99995468 More info Find a Dealer

* Convenient way to use the bow storage case - just pack the bag and drop it in. * Water resistant zippers keep dry goods protected * Insulated to hold shape even when empty * Can also be used in hull under storage case.


W99995473 More info Find a Dealer

* Patented Vacuum-vented trailering system * Durable solution-dyed polyester fabric * Supercharged" logos. For the ULTRA 300X and the 300LX. 2011-2013.


W99997101A More info Find a Dealer

* Fire Control 210DFC * For JET SKI watercraft use * 5BC rating


W99999103 More info Find a Dealer

* Use as a replacement for stock lanyards * Wrist cinch constructed of soft fabric covered tube material * JET SKI logo on wrist strap


W99999105 More info Find a Dealer

* Use as a replacement for stock lanyards * Wrist cinch constructed of soft fabric covered tube material * JET SKI logo on wrist strap


W99990592 More info Find a Dealer

* The only lift harness designed for extra large watercraft * Use a power lift or fork lift to lift and handle the watercraft * Vinyl coated steel brackets * High strength nylon webbing