2011 KAWASAKI JET SKI ULTRA 300X
JET SKI Performance Taken to a Whole New Level
2011 KAWASAKI JET SKI ULTRA 300X
JET SKI Performance Taken to a Whole New Level
You power Jet Ski junkies know who you are. You’re hard-core, and you won’t settle for anything less than the most capable watercraft available. Well, Kawasaki has exactly what you need in the form of the new and supremely powerful Kawasaki Jet Ski Ultra 300X – the most powerful Jet Ski ever built, one packing 300horsepower and all the massive, arm-straightening thrust that goes with it.
It’s OK. We’ll pause for a moment or two while your pulse slows down a bit…
As befits Kawasaki’s top-shelf performer, the Kawasaki Ultra 300X Jet Ski has been thoroughly redesigned for 2011, from nose to jet pump and everything in between. There’s more power and thrust, along with loads of engine strengthening to handle all that power and help ensure typical Kawasaki reliability. There’s new technology in the form of an all-new and high-tech supercharger and Kawasaki’s Electronic Throttle Valve system. And the race-derived hull has been extensively updated to provide the sort of top-tier handling hard-core enthusiasts expect.
Power and thrust are key ingredients in the Ultra 300X package, and the thoroughly massaged, 1,498cc inline-four DOHC engine supports that recipe like no other powerplant in all of watercraftdom. (Not a real word, we know. But we get so excited talking about this amazing engine!)
The big news for 2011 is the use of an all-new supercharger, one that’s two steps beyond the abilities of the roots-type unit fitted to previous X-model Jet Ski watercraft. Roots-type superchargers are known as fixed-displacement units, which produce large quantities of boost at all rpm levels, even right off idle, for a flat torque curve and usable, step-free power across the rev range. That’s a good thing.
The new unit is known as an Eaton Twin Vortices Series (TVS) roots supercharger, which features twin four-lobe rotors and offers a significant performance increase over the already impressive previous unit. Where the standard roots unit delivered compressed air in waves, the TVS unit offers continuous delivery for more power and smoother power delivery. Boost pressure is up significantly, from 11.0 psi to 17.0 psi. Supercharger efficiency is also up too, nearly 30 percent, while mechanical losses have been reduced to just 10 percent. A liquid-cooled intercooler helps keep the compressed intake charge cool, which stops power-robbing heat from sapping the system’s efficiency.
There’s more. Stronger and more advanced internal engine parts assist power production and help maintain the high level of reliability you’ve come to expect. Revised pistons team with a pumped-up valve train that includes stronger, hardened-nickel valves with thicker stems, a beefier cam chain and reworked exhaust camshaft with revised lobe profiles and increased durability. Stronger crankcases help harness all this extra horsepower, while an advanced and more efficient oil cooler helps minimize temperatures when the action gets really hot upstairs by sandwiching oil between two cooling jackets instead of one as before. The result is a staggering 300 horsepower, a significant jump from the previous model.
Controlling all this substantial power is made easier via the 300X’s array of futuristic electronics, which include a highly advanced fuel injection system controlled by a high-tech Electronic Control Unit (ECU), the “brain” of the entire system. The ECU not only commands the injectors and throttle bodies to route a precise amount of fuel/air mixture into the combustion chambers with help from the all-new Electronic Throttle Valve (ETV) system (which converts throttle lever inputs into electronic signals that are then passed on to the throttle body), it also allows a host of other technologies.
These include a range of varied riding “modes” such as Fuel Economy Assistance mode (for maximum economy during slower going), one-touch 5 mph mode (for use in no-wake zones), the 300X’s handy Electronic Cruise Control system (for steady cruising speeds when touring) and the Smart Learning Operation (SLO) mode, which allows newer riders to become familiar with the handling and response of this Jet Ski at a more relaxed pace. The setup also includes a digital dash display called the Economical Riding Indicator that shows the rider when riding conditions are most efficient (such as at planing speed, where hull resistance is minimal).
Another example of advanced design is the 300X’s Electronic Trim Control (ETC) system, which controls the nozzle angle of the revised, 160mm jet pump to adjust hull attitude to suit water surface conditions and riding style. The system has a plus-or-minus range of eight degrees, and works with the revised hull design to allow quicker turning characteristics. A redesigned impeller is better suited to the new engine’s performance, while the addition of horizontal guide “vanes” on the propulsion grate improves stability and hook-up during acceleration. With an even stronger engine coupling assembly, it all adds up to the most advanced watercraft powerplant in the industry.
The race-derived, fiberglass-reinforced plastic hull motivated by this astounding engine has also been redesigned for 2011. Engineers re-examined every inch of the already excellent-handling Ultra hull form, to enhance strength and achieve weight savings where possible. Hull thickness was reduced slightly throughout, and combined with special reinforcements in the inside bow area, the result is a lighter, stronger, more maneuverable and more stable hull. The hull cleaning system has been replaced with a two-circuit design, each with a dedicated flushing port for easier maintenance. Revised styling through the use of more radically edged contours results in a more aggressive look up front, too.
The Ultra 300X’s cockpit and rider accommodations didn’t escape the designers’ efforts either. An all-new high-visibility instrument panel has been fitted, which features an all-LCD info screen and visor that’s not only futuristic but wildly informative. The highly legible LCD display accommodates the aforementioned 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. You’ll always know what’s what when aboard the 300X.
Hard to believe, but revised ergonomics improve comfort significantly over the already plush 260X. The handlebar remains five-way adjustable to fit a range of riders and riding styles, with grips positioned nearly an inch wider to accommodate all-new handlebar switch assemblies. The wider bar allows even better maneuverability and is more comfortable, especially on longer rides. The two-piece seat offers roomy accommodations for three people, while a slightly narrower seat (at the front) makes it easier for riders to ride sitting or standing. The ergonomic deck design gives all riders plenty of legroom for increased comfort, and a redesigned reverse lever on the left side of the craft features a more ergonomic design and lighter operation.
Increased comfort means that longer, farther rides are easier than ever. And with nearly 21 gallons of fuel capacity – the most in its class – the 300X allows plenty of range for long-distance treks. A convenient storage bin with 54 gallons of capacity hides under the front cowl, and a dual drink holder keeps refreshments just a reach away.
Perhaps most stunning of all about all these performance- and comfort-related advancements is the fact that the new Ultra 300X weighs nearly 40 pounds less than a 2010 Ultra 260X.
Lightweight, powerful, blessed with superb handling and comfort, and featuring Kawasaki’s world-renowned design and reliability, the new Ultra 300X doesn’t just sit atop the performance watercraft pyramid – it commands the position proudly.
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2011 JET SKI Ultra 300X
Features and Benefits
New for 2011
- New electronic cruise control smoothly holds a set speed from 5 mph up to top speed
- Redesigned fiberglass-reinforced hull is lighter, stronger and more maneuverable
- New Eco Mode reduces and smoothes engine performance while conserving fuel
- New Eco Indicator shows the rider when the speed and throttle opening is in the 300X’s most efficient range
- New instrument panel with bigger speed numerals is easier to see
- New Electronic Trim Control allows rider to adjust nozzle angle and hull attitude
- New Twin Vortices Series roots supercharger offers a significant performance increase
- Class-shattering 300 horsepower for more performance and sharper handling
- Strong, light, deep-V hull offers both stability and great cornering performance
- Massive, industry-leading storage capacity lets you bring your gear with you
- Largest fuel tank in class keeps the fun going longer
- Five-position adjustable handlebars accommodates a variety of riders
- Separate keys for full power operation and Smart Learning Operation
300-horsepower Supercharged Engine
- Supercharged and intercooled 1,498cc, liquid-cooled inline four-cylinder engine
- Cast pistons with machine finishing for excellent durability
- Revised, high-lift exhaust cam lobes act upon new valves and offer increased durability
- Stronger hardened nickel valves offer superior heat resistance and enhanced reliability
- 33.4mm intake and 28.3mm exhaust valves
- Oil cooler features an additional layer for more efficient cooling
- Larger and stronger cam chain handles increased engine power
- Stronger, reinforced crankcase for added durability and reliability
- Coupling and damper revised to suit increased power
- Plastic intake manifold for decreased engine weight
- Optimum cylinder wall temperature is maintained by a check valve between the cylinder jacket and water muffler that shuts water flow off above 2,000 rpm, keeping the cooling water inside the cylinder jacket
- Precise power adjustments are easy with a throttle lever designed to prevent finger fatigue on longer rides
Eaton Twin Vortices Roots-type Supercharger
- Four-lobe design offers significant performance increase over standard roots-type unit
- System force-feeds the engine two liters of air with every revolution, providing a stable supply of high-pressure intake air at all rpm
- Planetary gearing increases supercharger speed by a factor of 2 for better response
- 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 very flat and meaty torque curve with step-free power across the entire rev range without any of the lag associated with turbochargers
- Produces more low-rpm boost than competitive or aftermarket systems, with a maximum of 17 psi of boost pressure
- Two different air bypass valves are used to prevent over boosting at low and medium rpm
- Efficiently cools high-pressure intake air, as cooler air is denser and makes more power
- Cooler air results in higher combustion efficiency and high engine output
- Liquid cooling allows the intercooler to maintain consistent thermal performance
Digital Fuel Injection System
- 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, 60mm bore diameter
- 4-into-2-into-1 powerboat-style exhaust system routes the exhaust pipe upward
- Allows the smoothest path for exhaust gases, maximizing exhaust efficiency
160mm Jet Propulsion
- Efficiently converts the Ultra 300X’s massive horsepower output into thrust using a larger-diameter 160mm jet pump
- Developed from Kawasaki’s racing machines, this new pump was specially designed to deliver stable output and good “bite” even when riding on rough water
- Revised impeller featuring a 3-blade design translates the 300X’s increased engine output into increased acceleration performance and quieter operation
- An eight-vane intake guide is used to smooth and regulate the flow of water from the impeller for efficient and powerful propulsion
- Redesigned, left-side reverse lever for easy operation
- Features a groove from the center to the rear of the plate to enhance straight-line stability
Electronic Trim Control System
- New system allows the angle of the jet pump nozzle to be controlled 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
- 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 optimum throttle response and smoothness
- Redundancy in the system ensures control is maintained in case of failure
- One-touch 5 mph mode allows push button no-wake zone riding
- Fuel Economy Assistance mode allows maximum fuel efficiency when going slow
- Economical Riding Indicator mode can be viewed on a graph on the new LCD info screen
Stronger, Lighter Hull Design
- Feedback from Kawasaki’s IJSBA championship-winning racing machines integrated into design enables it to cope with the engine’s increased horsepower
- Complete re-evaluation of hull thickness resulted in optimum strength balance and a significant weight reduction
- Specially reinforced inner bow is better suited to engine’s increased power output
- Hull offers a combination of high stability and responsive handling in both calm and rough-water conditions
- The lower hull is specially designed to distribute the engine and power delivery loads over a wide area
- The 300X’s deep-V hull enables a high bank angle and motorcycle-like turning performance. This reduces the lateral G-loads imposed on riders during turns, allowing them to better concentrate on riding
- The idealized 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 Ultra 300X can penetrate swells and waves with less shock, delivering extreme stability at low speeds and pushing through waves rather than bouncing over them at high speeds
- Battery located inside the front storage area near the center of the machine, avoiding concentrating heavy components at the rear and freeing up space inside the engine bay
- Integrated sponsons extend from the hull, providing stable wallow-free straight-line performance and contributing significantly to the 300X’s excellent high speed maneuverability while helping to retain the narrow hull design
- The Ultra 300X’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 rocketing forward, at high speeds or low, 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, 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
- Five-way adjustable handlebars allow operation while standing or sitting and suit a wide range of riders
- Relatively narrow and reshaped seat is comfortable whether riding stand-up, seated or with passengers
- Two-piece seat offers roomy accommodations for three people
- Ergonomic deck design gives plenty of legroom
- A long rear boarding step and dual grab handles makes it easy to climb onboard, and the step retracts inside the bumper to prevent damage
- A quick and easy hose connection allows an easy method to flush sea water out of the engine
- Mirrors are mounted to the upper deck to facilitate opening of the hatch cover
- The Ultra 300X offers 56 gallons of total storage capacity
- The large-capacity, fully sealed storage area with a detachable storage tray has plenty of room for recreational equipment
- A detachable drink holder with space for two drink bottles is mounted on the center console
- Ideal for small items like a ski rope, a compact storage area is integrated with the under-seat rear grip
Extra-large Fuel Capacity
- 20.6-gallon fuel tank has more fuel capacity than any machine in its class
All-New Digital Instrumentation
- A single, highly legible LCD screen replaces the dual meter setup of the 260X
- New instrumentation includes the new riding modes, as well as external water and air temperature, clock, time, trip and hour meters, tachometer (in digital or graph displays), speedometer and max speed functions
- Cockpit visor repositioned higher for increased visibility
2011 JET SKI Ultra 300X Specifications*
Supercharged and intercooled, four-stroke, DOHC, four valves per cylinder, inline four-cylinder
Bore x stroke:
83.0 x 69.2mm
Twin Vortices Roots-type supercharger with air-to-water intercooler
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Composed: 10/04/2010 | Modified: 06/10/2011
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