• 2015 Kawasaki 310 SE | Pro Rider Watercraft Magazine

    2015 Kawasaki 310 SE

    2015 KAWASAKI JET SKI® ULTRA® 310X SE  High-Performance Seating and Aggressive Styling Sets This Watercraft Apart


    As innovators for the personal watercraft (PWC) industry for four decades, Kawasaki surprised the entire personal watercraft industry when it debuted the Jet Ski Ultra 300X watercraft in 2011. Now, the 2015 Kawasaki Jet Ski® Ultra® 310X SE watercraft continues to best the PWC competition with its top-of-the-line features and innovation.

    The 2015 Jet Ski Ultra 310X SE is finished in Ebony and Candy Burnt Orange that includes an aggressive competition-style graphics kit as well as a comfortable sport seat in this Special Edition package.


    • Supercharged DOHC inline four-cylinder engine produces 310 horsepower1
    • Impeller features a 3-blade design that gives the 310X greater initial acceleration
    • Sport seat offers a special support bolster and a grippy KX™ motocross-style seat cover for hard sport riding
    • Aggressive graphics
    • Instrumentation includes a fuel consumption function, 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
    • The 310X SE’s deep-V hull offers superb straight-line tracking and precise cornering performance
    • Industry-leading, 56-gallon storage capacity
    • 20.6-gallon fuel tank is the largest in its class
    • Separate keys for full power operation and Smart Learning Operation (SLO)



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

    The 2015 Kawasaki Jet Ski Ultra 310X astonishes with 310 horsepower[1] thanks to an engine that is the basis for an open-water, race-winning powerplant. It propels the sporty-handling hull that’s capable of tackling rough water with ease, or comfortably hauling three adults in addition to an impressive payload. Power, handling, versatility – the Ultra 310X brings it in ways the PWC competition simply can’t.

    With 310 horsepower1 on tap, the Ultra 310X’s Digital Fuel Injected (DFI®) 1,498cc engine is the reigning king of thrust, and its crown is the high-tech Eaton TVS series supercharger. The supercharger gives the engine exhilarating yet linear power, and its race-derived hull design is capable of carving precise turns in a wide range of water conditions, from sheet-glass to chopped-surf; exactly what hard core PWC performance enthusiasts would expect from a Kawasaki Jet Ski watercraft.

    If strong acceleration is your idea of a good time, then the Ultra 310X, and its fuel-injected, DOHC, inline four-cylinder engine offer plenty of entertainment with a pulse-quickening performance like no other PWC powerplant on the water. Its roots-type Eaton Twin Vortices Series (TVS) supercharger uses a pair of four-lobe rotors to boost engine output. The key lies in its fixed-displacement design, which produces large quantities of boost at all rpm, from idle to redline. It gives the 310X a flat torque curve and linear power across the rev range. Yes, the 310X is quick, but it’s also smooth!

    The Ultra 310X has seamless power delivery thanks to its ability to channel compressed air through the engine at a steady rate, instead of in waves, as other superchargers do. And its liquid-cooled intercooler helps to cool the compressed intake charge as it enters the Ultra 310X’s combustion chambers. Cooler air equals denser air, which means less power is lost to performance robbing engine heat.

    The 310X features an intake manifold that is long and slim to increase low-mid range power, while power and greater fuel efficiency are achieved via a high-volume fuel pump. Kawasaki’s Fuel Economy Assistance mode in the Electronic Control Unit (ECU) significantly increases range for long-distance riding.

    Ultimate performance is nothing without rock-solid reliability, and the 310X engine was built from the bottom to top for long-lasting durability in a supercharged application. The 310X’s pistons have a V-groove at the second ring (between the top and second ring grooves) for more consistent oil retention at high loads. Toaid piston cooling, the oil jet system that cools the undersides of the piston crowns uses two jets per piston rather than just one for enhanced performance. Baffles in the oil pan help prevent oil from accumulating on one side of the pan during tight turns or sudden acceleration or deceleration, and the crankcase also has large return holes to facilitate oil return to the pan.



    The engine water jackets are thick for optimum cooling performance, and they feature a check-valve that opens when the engine is idling or stopped, but closes when it is running to keep the engine cool without over-cooling. The 310X also incorporates a knock sensor that improves engine protection by retarding ignition to suppress abnormal combustion – or engine knock – if it should occur. The system activates a buzzer and the condition is indicated on the instrument panel to warn the rider.

    A perfect example of Kawasaki’s engineering know-how lies in the Ultra 310X super-efficient oil cooler, which helps minimize engine temperatures by circulating oil between two cooling jackets. The result is 310 class-leading horsepower3 that’s also totally reliable.

    Last on the powertrain list is an advanced impeller design with specifically designed blade angles for better acceleration out of the hole. During acceleration, when cruising or at high speed, horizontal guide “vanes” on the propulsion grate improve hull tracking and reduce cavitation during acceleration for better hook-up. It’s just one more detail item that adds up to the most advanced production watercraft propulsion system in the industry.



    An impressive collection of futuristic electronics is standard on the Ultra 310X. Naturally, Kawasaki’s high-tech Electronic Control Unit (ECU) is the command center of the entire system. The ECU coordinates the injectors and throttle bodies of Kawasaki’s highly advanced DFI to route the optimum amount of air/fuel mixture into the combustion chambers with help from the Electronic Throttle Valve (ETV) system, which converts throttle lever inputs into electronic signals that are then passed on to the throttle body.

    Ultra 310X has technologically superior rider aids for a range of riding modes. A few examples include the Fuel Economy Assist mode for maximum economy, which switches the ECU to a fuel map that focuses on gas mileage. There is also a one-touch 5mph mode for no-wake zones and a convenient Electronic Cruise Control system to set a steady cruising speed when touring. The Smart Learning Operation, or SLO-Mode, reduces engine output so newer riders can become familiar with the handling and response of the Jet Ski watercraft at a more relaxed pace. The customer is provided with two keys, one for SLO-Mode and the other for full-power operation, to help prevent confusion over which setting is in use.

    Furthermore, the electronics package includes a smart Economical Riding Indicator on the digital display. This alerts the rider when the engine is operating in the most fuel-efficient manner, such as when planing at speeds where hull resistance is substantially reduced.

    Electric Trim Control (ETC) is another example of the advanced technology that Kawasaki engineers have packed into the Ultra 310X. The ETC allows the rider to control the nozzle angle of the 160mm jet pump to adjust the hull attitude to suit both water surface conditions and riding style. The system has a plus-or-minus range of eight degrees, and it allows the Ultra 310X’s hull to take the fullest advantage of its razor-sharp turning characteristics.



    Ultra 310X’s race-derived, fiberglass-reinforced hull is meticulously designed to be both incredibly strong and surprisingly light. Special reinforcements inside the hull help it to retain strength so its overall thickness can be optimized for low weight, which aids in maneuverability.

    The hull also features an ingenious cleaning system with a two-circuit design, with each circuit utilizing a dedicated flushing port for the engine and intercooler to facilitate easy maintenance. Edgy-styled contours and nose trim combine to give the Ultra 310X’s bow a sleek and aggressive look.



    Of course, it’s equally important that the Ultra 310X cockpit and rider accommodations are as useful and comfortable as its high-performance engine and hull features. Front and center is a high-visibility instrument panel with an all-LCD info screen design that’s not only futuristic but also allows the rider easy monitoring of all the machine’s vital information. Aided by a visor for easier viewing in sunny conditions, the highly legible LCD display boasts a fuel consumption function that can display gallons per hour or gallons per minute, a boost meter scale and riding-mode displays along with a range of other functions, including clock time, trip and hour meter; digital or bar-graph tachometer; water and air temperature gauges; speedometer and max-speed functions. Keeping track of the Ultra 310X’s vital signs is a cinch.

    The Ultra 310X SE’s ergonomic appointments not only match its quality aesthetics, but they’re designed for supreme rider comfort to boot. The Ultra 310X handlebar sits in a naturally ergonomic position and isadjustable to five different positions to fit a wide range of riders and riding styles. The wide bar offers plenty of leverage for easy maneuverability, which makes long rides more comfortable, and its gun-grip style handgrips offer a natural feel for reduced hand fatigue as well as sportier looks.

    The 310X SE hull-mounted mirrors include a curvature that gives the rider a wide view for excellentrearward visibility. A special two-piece Sportseat was designed for aggressive sport riding and features a raised bolster to support the rider under hard acceleration.  The sport seat’s narrow front facilitates sitting or standing when the Ultra 310X SE is ridden solo. The highly functional passenger handrail positioning places the handrail higher for a more natural ergonomic location, helping to reduce passenger fatigue.

    And Kawasaki engineers didn’t stop there. The Ultra 310X’s deck design gives all riders plenty of legroom for ideal comfort, and its deck material offers excellent grip for the rider’s feet. A reverse lever on the left side of the craft is also ergonomically designed for easy and precise operation.

    With 20.6 gallons of fuel capacity – the most in its class – the Ultra 310X allows plenty of range for long-distance rides. Up front, a handy storage bin with a generous 54 gallons of capacity is located under the front cowl, and dual drink holders keep refreshments within easy reach. Total combined storage capacity for the Ultra 310X is an industry-leading 56 gallons. You really can take it with you!

    The Kawasaki Jet Ski watercraft is legendary in the personal watercraft world for good reason, and the Jet Ski Ultra 310X SE PWC lives up to its name by pushing the envelope of performance, style and versatility.



    Kawasaki Genuine Accessories, such as a Protective Cover, Bumpers, Anchor, etc, are available atauthorized Kawasaki dealers.



    Kawasaki Motors Corp., U.S.A. (KMC) markets and distributes Kawasaki motorcycles, ATVs, side x sides, andJet Ski® watercraft through a network of almost 1,200 independent retailers, with close to an additional 7,400 retailers specializing in general purpose engines. KMC and its affiliates employ nearly 3,100 people in the United States, with 300 of them located at KMC’s Irvine, California headquarters.

    Kawasaki’s tagline, “Let the good times roll.™”, is recognized worldwide. The Kawasaki brand is synonymous with powerful, stylish and category-leading vehicles. Information about Kawasaki’s complete line of powersports products and Kawasaki affiliates can be found on the Internet at www.kawasaki.com.


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    2015 Jet Ski® Ultra® 310X SE


    Features and Benefits


    Key Features

    –          Supercharged DOHC inline four-cylinder engine produces a staggering 310 horsepower

    –          Impeller features a 3-blade design that gives the 310X greater initial acceleration

    –          Sport seat offers a special support bolster and a grippy KX™-motocross-like seat cover for hard sport riding

    –          Aggressive graphics match the hard-core Ultra 310R model

    –          Instrumentation includes a fuel consumption function, 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

    –          Strong and light, the 310X SE’s deep-V hull offers superb straight-line tracking and precise cornering performance

    –          Industry-leading, 56-gallon storage capacity lets you bring your gear with you

    –          20.6-gallon fuel tank is the largest in its class, providing tremendous range for long rides

    –          Separate keys for full power operation and Smart Learning Operation


    310-horsepowerSupercharged Engine

    –          1,498cc, liquid-cooled inline four-cylinder engine

    –          Eaton TVS constant-displacement supercharger and liquid-cooled intercooler provide instant and consistent boost for outstanding performance throughout the rev range

    –          Intake manifold is shaped for optimum low/mid-range power

    –          Cast pistons feature 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 superior fuel flow volume

    –          Thick water jackets enhance 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

    –          Two piston cooling oil jets help cool the pistons

    –          Oil pan features baffle plates to prevent oil slosh during tight turns or extreme acceleration/deceleration

    –          Crankcase oil return holes offer quick oil return to the oil pan


    Eaton Twin Vortices Roots-type Supercharger

    –          Four-lobe, constant-displacement design offers significant performance increase over standard roots-type unit

    –          System force-feeds the engine two liters of air with every revolution, providing a constant supply of high-pressure intake air at all rpm

    –          Delivers compressed air continuously, not in waves, for smoother power delivery

    –          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

    –          Produces more low-rpm boost than competitive or aftermarket systems, with a maximum of 17psi of boost pressure

    –          Two different air bypass valves are used to prevent over boosting at low and medium rpm


    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


    Digital Fuel Injection System

    –          High-flow fuel injectors with four orifices are fitted for combustion efficiency

    –          Single throttle body features a large, 60mm bore diameter



    –          4-into-2-into-1 exhaust system routes the exhaust pipe upward and allows the smoothest path for exhaust gases, maximizing exhaust efficiency


    160mm Jet Pump

    –          Large-diameter, race-developed 160mm jet pump efficiently converts the Ultra 310X’s massive horsepower output into instantaneous thrust

    –          Pump is designed to deliver consistent output and good “bite” even in rough water conditions

    –          Impeller features a 3-blade design that gives the 310X greater initial acceleration

    –          Eight-vane intake guides and regulates the flow of water to the impeller for consistent, efficient and powerful propulsion


    Ride Plate

    –          Features a groove from the center to the rear of the plate to enhance straight-line tracking


    Electric Trim Control System

    –          Allows the angle of the jet pump nozzle to be controlled by the rider to adjust the attitude of the hull to suit water surface conditions and riding styles

    –          Adjustment range is plus or minus 8 degrees from standard


    Electronic Throttle Valve (ETV) with Cruise Control

    –          Fuel Economy Assistance mode revised for significant fuel savings and increased range

    –          Convenient electronic cruise control smoothly holds a set speed from 5 mph up to top speed

    –          Accelerator Position Sensor (APS) converts throttle lever input to an electronic signal that’s used to control the throttle valve via an electric motor for crisp and smooth throttle response

    –          Redundancy in the system helps ensure control is maintained in case of failure

    –          One-touch, push-button 5 mph mode allows hassle-free no-wake zone riding

    –          Economical Riding Indicator mode can be viewed on a graph on the LCD info screen

    –          Eco Mode softens and smoothes engine performance while conserving fuel


    Strong, Light Hull Design

    –          Designed to emulate the performance of Kawasaki’s IJSBA championship-winning race machines

    –          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-degree V-angle at the bottom of the hull helps reduce unwanted spinouts during sharp turns

    –          Delivers the neutral handling and turning characteristics for which Kawasaki JET SKI watercraft are famous

    –          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 maneuverability while helping to retain the narrow hull design


    Quattro KSD

    –          The 310X’s Kawasaki Splash Deflector 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


    Kawasaki Smart Steering®/SLO Mode

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

    –          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


    Comfort and Convenience

    –          Sport seat includes a special support bolster and a grippy KX-motocross-like seat cover for hard sport riding

    –          Passenger handrail is located in an ergo-friendly location to reduce passenger fatigue and features a handle for better grip

    –          Optimally curved mirrors feature a wide rear view and are mounted to the upper deck via brackets

    –          Ergonomic deck design gives plenty of legroom

    –          Left-side reverse lever is ergonomically designed for easy operation

    –          Quick and easy hose connection allows a simple method to flush sea water out of the engine


    Capacious Storage

    –          The Ultra 310X offers a class-leading 56-gallons of total storage capacity

    –          Large-capacity, fully sealed storage area with detachable storage tray offers ample room for recreational equipment

    –          A detachable drink holder with space for two drink bottles is mounted on the center console

    –          Compact integrated underseat storage area is Ideal for small items like a ski rope


    Extra-large Fuel Capacity

    –          20.6-gallon fuel tank boasts more capacity than any machine in its class, extending range


    Digital Instrumentation

    –          LCD screen features an easy-to-read face design

    –          Instrumentation includes a 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

    –          ECO Indicator shows the rider when the speed and throttle opening is in the 310X’s most efficient range
    2015 Jet Ski® Ultra® 310X SE Specifications*


    Engine:Supercharged and intercooled, four-stroke, DOHC, four valves per cylinder, inline four-cylinder
    Bore x stroke:83.0 x 69.2mm
    Compression ratio:8.2:1
    Induction system:Eaton Twin Vortices Series roots-type supercharger with air-to-water intercooler
    Maximum boost:16.8psi
    Maximum horsepower:310 hp   (Horsepower measured in PS at the crankshaft under controlled conditions. Actual performance may vary.)
    Cooling system:Inducted water
    Fuel system:Digital fuel injection
    Ignition:TCBI with digital advance
    Lubrication:Semi-dry sump system
    Coupling:Direct drive from engine
    Propulsion system:160mm jet pump, axial-flow, single stage
    Impeller:Three-blade, oval-edge stainless steel
    Thrust:1,890 lb
    Seating capacity:Three-person
    Load capacity:496 lb
    Fuel capacity:20.6-gallons
    Oil capacity:6.0 quarts
    Storage capacity:56-gallons
    Curb weight: **1,051.8 lb
    Overall length:132.7”
    Overall width:47.0”
    Overall height:45.3”
    Color:Ebony / Candy Burnt Orange
    Warranty:12 months
    Kawasaki Protection Plan:12, 24, 36 or 48 months
    Wholesale distributor:Kawasaki Motors Corp., U.S.A.9950 Jeronimo RoadIrvine, California 92618949-770-0400


    *Specifications are subject to change. Media are encouraged to visit www.kawasakimedia.com for most current specifications.

    ** Includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent of capacity) and tool kit (if supplied).

    [1] Horsepower measured in PS at the crankshaft under controlled conditions. Actual performance may vary.


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