2017 Ultra 310X

The Fastest Jet Ski on the Planet Just Got Faster!

Personal watercraft (PWC) innovators for four decades, Kawasaki surprised the entire industry when it debuted the Jet Ski Ultra 300X watercraft. Now a substantially improved Jet Ski, Ultra 310X watercraft, raises the PWC stakes before the competition has even had a chance to place a 300 class bet!

With incredible boost from an Eaton Twin Vortices Supercharger, the big Kawasaki Ninja-inspired marine engine pumps out 310 horsepower* through the pump for incredible hook-up and acceleration.

Not only is the Ultra 310X 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.



Key Features

  • Supercharged DOHC inline four-cylinder engine produces a staggering 310 horsepower, it’s the most powerful production PWC in history
  • Pump impeller features a high-efficency 3-blade design that gives the 310X greater initial acceleration
  • Strong and light, the 310X’s deep-V hull offers superb straight-line tracking and precise cornering performance
  • The instrumentation includes a new fuel consumption function, revised boost meter scale, riding modes, external water and air temperature, clock, time, trip and hour meters, tachometer (in digital or graph displays), speedometer and max speed functions
  • Eaton TVS constant-displacement supercharger and liquid-cooled intercooler provide instant and consistent boost for outstanding performance throughout the rev range
  • Industry-leading, 212L storage capacity lets you bring your gear with you
  • 78L fuel tank is the largest in its class, providing tremendous range for long rides
  • Separate keys for full power operation and Smart Learning Operation


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310 Horsepower Supercharged Engine

1,498cc, liquid-cooled inline four-cylinder engine makes 10 additional horsepower through reduced mechanical loss, improved efficiency. The Eaton TVS constant-displacement supercharger and liquid-cooled intercooler provide instant and consistent boost for outstanding performance throughout the rev range.

  • Heat-resistant plastic intake manifold is reshaped for improved low-mid range power
  • The cast pistons feature additional ring land V-grooves for better oil retention
  • Hardened nickel 33.4mm intake and 28.3mm exhaust valves offer superior reliability
  • Two-layer oil cooler offers efficient cooling
  • Large cam chain increases reliability in a supercharged engine application
  • Reinforced crankcase adds to engine’s durability and reliability
  • Fuel pump provides a high pressure, high flow fuel for increased power and better fuel efficiency.
  • Thick water jackets improve cooling performance
  • Check valve system between the cylinder jacket and water muffler that shuts water flow off above 2,000 rpm, to keep the cooling water inside the cylinder jacket for optimum cooling performance
  • Piston cooling oil jets increased from one jet per piston to two jets per piston for increased piston cooling
  • Oil pan features additional baffle plates to prevent oil slosh during tight turns or extreme acceleration/deceleration
  • Crankcase oil return holes are designed for quicker oil return to the oil pan

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

Air-to-Water Intercooler

Efficiently cools high-pressure intake air – cooler air is denser and makes more power. Liquid-cooled intercooler design maintains consistent thermal performance.

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Pump Impeller

To suit the 160 mm jet pump, the Ultra 310X gets an impeller designed to efficiently convert all the extra power into forward thrust. The pump impeller features a high-efficiency 3-blade design that gives the 310X great initial acceleration.

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Quattro KSD

The 310X’s Kawasaki Splash Deflector (KSD) uses three bottom-mounted ridges and an additional deflector mounted at the top to deflect water splashing forward from under the hull. Whether turning or straight-line riding at any speed the Quattro KSD minimizes spray, allowing greater rider concentration.



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Strong, Light Hull Design

The reinforced inner bow is extremely light with ample strength to handle the engine’s power output. Exemplary straight-line tracking and responsive handling in both calm and rough-water conditions set performance benchmarks for the class. The lower hull is specially designed to distribute the engine and power delivery loads over a wide area.

Deep-V hull design enables a steep bank angle for motorcycle-like turning performance. This reduces the lateral G-loads imposed on riders during turns, allowing them to better concentrate on riding. The 22.5° V-angle at the bottom of the hull helps reduce unwanted spinouts during sharp turns. This all assists in delivering the neutral handling and turning characteristics for which Kawasaki JET SKI watercraft are famous.

The bottom of the hull slants upward steeply from the center section to the bow, so the 310X can penetrate swells and waves with less shock, pushing through waves rather than bouncing over them at high speeds. Integrated sponsons extend from the hull, providing wallow-free straight-line performance and contributing significantly to the 310X’s excellent manoeuvrability while helping to retain the narrow hull design.

Jet Pump

To effectively convert the 310 PS output into thrust, the Ultra 310X utilises a large 160mm jet pump, designed using eight guide vanes. The pump delivers superior “traction” in rough water conditions and significantly contributes to the Ultra 310X’s mind-boggling acceleration.

The pump is designed to deliver consistent output and good “bite” even in rough water conditions. the pump impeller features a high-efficency 3-blade design that gives the 310X great initial acceleration and the eight-vane intake guides and regulates the flow of water to the impeller for consistent, efficient and powerful propulsion.


The Ultra 310X 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.



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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.

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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.

Adjustment range is plus or minus 8° from standard.

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Electronic Throttle Valve with Cruise Control

Fuel Economy Assistance mode for significant fuel savings and increased range. Convenient electronic cruise control smoothly holds a set speed from 8 kph up to top speed.

One-touch, push-button 8 kph mode allows hassle-free no-wake zone riding and the  economical Riding Indicator mode can be viewed on a graph on the LCD info screen.

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Large Capacity Storage

The huge 200 litre front storage compartment comes with removable tray combined with a centre console storage area.

  • Large-capacity, fully sealed storage area with detachable storage tray offers ample room for recreational equipment
  • Compact integrated underseat storage area is Ideal for small items like a ski rope


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.

Comfort and Convenience

Roomy three-passenger seat offers ample support plus all-day comfort whether riding stand-up solo, seated or with passengers.  The passenger handrail on the Ultra 310X is located to a more ergo-friendly location to help reduce passenger fatigue and features a redesigned handle for better grip. The optimally curved mirrors have been designed for a wider rear view and are mounted to the upper deck via new brackets

An ergonomic deck design gives plenty of legroom and the left-side reverse lever is ergonomically designed for easy operation. At the end of the day on the water a quick and easy hose connection allows a simple method to flush sea water out of the engine.

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Eaton Twin Vortices Root-Type Supercharger

Four-lobe, constant-displacement design offers significant performance increase over standard roots-type unit. The system force-feeds the engine two liters of air with every revolution, providing a constant supply of high-pressure intake air at all rpm.  The compressed air is delivered continuously, not in waves, for smoother power delivery.

The supercharger produces large amounts of boost, even at low rpm, for instant and powerful acceleration right off of idle.  Provides a flat and linear torque curve with mellifluous, lag-free power across the entire rev range.  This system produces more low-rpm boost than competitive or aftermarket systems, with a maximum of 17 psi of boost pressure.
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Instrument Panel

The LCD screen features an design that’s easy to read. The instrumentation includes a fuel consumption function, boost meter, riding modes, external water and air temperature, clock, time, trip and hour meters, tachometer (in digital or graph displays), speedometer and max speed functions.

Eco Indicator shows the rider when the speed and throttle opening is in the 310X’s most efficient range. The Kawasaki Eco Mode reduces and smoothes engine performance while conserving fuel.

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Beginner Friendly

Smart Learning Operation (SLO) allows newer riders to become familiar with the handling and response of this JET SKI watercraft at a more relaxed pace.

Two separate keys, one for SLO mode and one for full-power operation, help prevent confusion over which setting is in use.

Kawasaki Smart Steering® (KSS®) monitors steering input and engine speed and, when certain conditions are met, intelligently raises rpm to help initiate a turn.

2017JT1500AHF Accessories

Genuine Kawasaki Accessories

A great range of Genuine Kawasaki accessories are available from your local Kawasaki Jet Ski Dealership.

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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 8.2:1
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 8,407 N {857.3 kgf}
  Impeller diameter ø160
Steering Steerable nozzle


Maximum power 228 kW {310 PS} / 8,000 rpm
Maximum torque 286 N.m / 6,000 rpm


Overall length 3,370 mm
Overall width 1,195 mm
Overall height 1,150 mm
Curb mass 477 kg includes full tank of fuel and all fuids at optium levels
Fuel capacity 78 litres


12 months


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Ebony / Metallic Stardust White

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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