In the water the STX-15F is very graceful, not very stylish but a high performance Jet Ski. Performance this is the right word to characterized the Kawasaki Jet Ski STX-15F. There’s no question about it this Jet Ski it’s on the top because of its performance and the experience of the Kawasaki engineers and the implementation of the engine from the Kawasaki Ninja® motorcycle line.
Starting with a high-performance engine from the legendary Kawasaki Ninja® motorcycle line, the Jet Ski STX-15F delivers a flat torque curve for a smooth spread of power across the entire rpm range. A long-stroke design was needed to achieve this broad torque curve, so while the engine’s bore is the same as the smaller Jet Ski STX-12F, its stroke is 13.8 mm longer, increasing displacement to 1,498cc. Dual overhead cams, four valves per cylinder, fuel injection and electronic engine control – to harmonize the fuel and ignition systems – provide maximum performance and reliability, and the fuel injection system utilizes four injectors and a large 60 mm throttle body to deliver a quick response.
The four-stroke engine is rubber-mounted in the hull and includes a water-jacketed, performance-tuned exhaust system, dual mufflers and a large-capacity air box.
For propulsion, the STX-15F utilizes a direct drive axial-flow jet pump connected to an oval-edge, stainless steel, three-blade impeller and an 82mm jet pump nozzle for powerful acceleration. The STX-15F engine produces its peak power at a relatively low rpm while matching the impeller’s peak efficiency rpm. This eliminates the need for a complex gear reduction unit, resulting in improved durability, increased fuel economy as well as reduced vibration and noise.
The Kawasaki Jet Ski STX-15F is equipped whit the Kawasaki Smart Steering® (KSS®), which features an on-board microprocessor that is electronically linked to a steering sensor. If the handlebar is fully turned in both direction and the engine rpm drops from a designated rpm as when the throttle is released at speed – the microprocessor activates the KSS, which raises engine rpm to provide enough thrust to initiate the desired turn.
The Kawasaki’s innovative electronic Smart Learning Operation (SLO) which is accessible directly on the instrumental panel can be programmed to place a limit on maximum engine speed so novice riders can experience riding at a reduced speed while they master proper riding techniques.
The Kawasaki Jet Ski STX-15F has a muscular and aggressive look, but is lighter and more compact than the competition. The hatch cover is styled from sleek ABS plastic, adding to the fresh, high-quality styling of the STX-15F, and a hydraulic damper holds the hatch cover open, allowing easy access until the rider closes it. The mirrors are also made of ABS plastic and mount directly to the deck, which adds to the sleek lines. The open rear deck of the STX-15F features abundant space for getting into water skis or on a wakeboard, and reboarding in deep water is simplified with an automatically retracting boarding step located on the rear of the hull. The rear deck can also accommodate items needed for a day on the water, like a cooler. There’s also a water-resistant storage space, an easily accessible glove box and additional room for gear located under the seat. Other features include a LCD instrument panel so the rider can monitor the fuel level, speed, engine rpm, trip distance and time. Fuel capacity is a generous 16.4 gallons, for extended rides. Warning lamps alert the rider to low fuel level or high engine temperature, and a magnetic keyed ignition switch helps deter unauthorized operation.
The technology build in this Jet Ski makes the ride perfect. At slow speeds it is a bit nose heavy and tips slightly from side to side, but that’s ok. This was done for a purpose, to make it handle better when you need it to. Sub plane speeds are comfortable and controllable, riding solo or with 2 adult passengers is easy to control and maneuver around the docks both in forward and reverse. There is so much power, that even given poor conditions and a heavy load, this unit gets up to speed and out of trouble instantly.
Acceleration is impressive: 66 mph. The STX-15F gets to full speed very quickly even with 3 adults and in slightly rough water. Cruise is somewhere near 45 mph with the craft easily hitting the 58 mph mark full throttle with 3 adults riding. Cornering on the STX-15F is not for the faint hearted, this watercraft sticks like glue.
The Kawasaki goal was simple: develop the highest performing 4-stroke watercraft on the market. The method was challenging – combine a high-revving, large-displacement 4-stroke engine in a compact, sporty-handling hull. The result was fantastic: the Jet Ski STX-15F, a watercraft that outperforms everything in its category.
Adapted for watercraft use from a legendary Ninja® sport motorcycle engine
The strong, 1,498cc, four-stroke engine provides incredibly strong low- and mid-range torque
Intake tract designed for maximum performance
Digital fuel injection provides great throttle response, smooth engine performance and quick acceleration, as well as easy starting and excellent fuel economy
Throttle body diameter is 60mm, 6mm larger than the STX®-12F
Dual overhead cams (DOHC) are light and compact for less valve train inertial mass
Four-valve cylinder head with large valves provide better intake and exhaust flow to improve torque and power
Intake and exhaust valve lift as well as timing are set to reduce exhaust emissions
Tip-over protection shuts engine off if craft tilts more than 61°
Waterproof ECU and ignition coils protects the ignition system from electrical shorts
Unique semi-dry sump oil system lowers the crankshaft in the engine, eliminates the need for scavenging pumps, and if the craft is capsized the oil stays in the sump instead of flooding the crankcase
Kawasaki’s patented oil separator provides fail-safe venting for the crankcase and prevents oil from flowing into the intake tract if the craft is capsized
Large capacity airbox lowers engine noise and improves air intake flow
Double waterbox mufflers deliver whisper-quiet operation
Has earned a Three-Star Ultra-Low Emissions rating, meeting the Environmental Protection Agency’s strictest standards, as well as the California Air Resources Board standards for 2008
Kawasaki Smart Steering® (KSS®) monitors steering input and engine speed and, when certain conditions are met, raises rpm to initiate a desired turn
Reverse bucket is designed for precise direction control when backing and is made of injection molded material to prevent corrosion
Reverse increases maneuverability in tight places
Hull size is optimized for a sporty, nimble ride
Injection-molded sponsons deliver ultra-responsive turning, while enhancing stability
Three-blade oval-edge stainless steel impeller pitch provides maximum efficiency and incredible durability
Shielded jet propulsion system gives greater protection from damage
Kawasaki Splash Deflector (KSD) helps keep spray off the operator and passenger
Boarding step retracts automatically, making reboarding in deep water easier
Large capacity fuel tank allows more riding between fill-ups
Stylish hatch cover has a muscular, performance look
Handle position makes “stand-up” performance riding easier and provides ample room for a wide range of riders
Spacious, close-to-the-water open rear deck provides plenty of spacious area for putting on skis or a wakeboard and makes deep water boarding easier
Engine: Four-stroke, four-cylinder inline
Bore x stroke: 83.0 x 69.2mm
Compression ratio: 10.6:1
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: Jet pump, axial-flow, single stage
Impeller: Three-blade, oval-edge stainless steel
Thrust: 957 lbs
Seating capacity: Three person
Load capacity: 496 lbs
Fuel capacity: 16.4 gal
Oil capacity: 5.3 qt
Storage capacity: 23.5 gal
Dry weight: 745 lbs
Overall length: 122.8 in
Overall width: 46.5 in
Overall height: 41.3 in
Color: Jet White/Metallic Nocturne Blue
Max. speed: (approx.) 57.35 knots (66 mph)
MSRP: 9,499 USD