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Kawasaki jet-ski STX-12F

To celebrate the 30th anniversary of JET SKI® watercraft, Kawasaki Motors Corp., U.S.A., is introducing the most technologically advanced JET SKI watercraft ever to take its position on the water — the 2003 JET SKI STX-12F. The STX-12F offers a highly efficient engine design and ultra low emissions at a lower manufacturer’s suggested retail price than any other 2003 four-stroke personal watercraft.
The all-new three-passenger STX-12F watercraft combines Kawasaki’s proven four-stroke, four-cylinder technology with the popular design and features of the highly regarded JET SKI 1100 STX D.I. watercraft. The STX-12F boasts excellent towing capabilities to pull skiers, tubers or wakeboarders with ease, and efficient fuel economy for touring and exploring plus ample storage for personal items.

“Kawasaki has 30 years of experience in building high performance, four-stroke engines, from the original Z-1 motorcycle to the current generation of NINJA® sportbikes,” said Patrick Kelly, product manager, Kawasaki Motors Corp., U.S.A. “Power for the new STX-12F comes courtesy of the legendary Kawasaki NINJA® ZX-12R motorcycle — one of the most powerful and advanced engines in the world.”

Adapted for use in a JET SKI watercraft, the 1,199cc water-cooled engine with dual overhead camshafts pumps out plenty of power for optimum performance and boasts low emissions while purring quietly on the water. The environmentally friendly

STX-12F meets the strictest existing emission standards for both the Environmental Protection Agency and the California Air Resources Board (CARB). In fact, the STX-12F already meets CARB’s ultra-low “three-star” rating, a full five years ahead of time.

The engine of the STX-12F weighs 11 pounds more than the engine of the 1100 STX D.I. and is only slightly larger in overall dimensions. The STX-12F features dual overhead cams, four valves per cylinder, fuel injection and an electronic engine control unit (ECU) that harmonizes the fuel system and the ignition system to provide maximum performance and reliability.

The fuel injection system utilizes four injectors and a single 54mm throttle body to provide fuel for this NINJA-based engine, resulting in smooth power delivery and instant starting in both hot and cold weather.

The engine’s highly tuned exhaust system is water-jacketed to help reduce underhood temperatures and keep the STX-12F running as quietly as possible. The STX-12F also features dual water mufflers for very low exhaust noise. The large capacity airbox is specially designed to reduce noise levels and the engine is rubber-mounted in the hull.

The STX-12F features an open-loop cooling system that utilizes an intake filter and draws cooling water from the jet pump, providing the STX-12F with consistent operating temperatures for maximum performance.

Unlike the ZX-12R motorcycle, which uses a clutch and transmission to supply power to the rear wheel, the JET SKI STX-12F utilizes a direct drive axial-flow pump that is connected to an oval-edge, stainless steel, three-blade impeller. The STX-12F direct drive has no gear reduction unit, allowing the STX-12F’s engine to turn a lower rpm for less stress and wear and tear, less vibration, less noise and better fuel consumption. A reverse function allows for easy maneuverability in tight quarters.

The STX-12F is also equipped with Kawasaki’s most advanced steering technology — Kawasaki Smart Steering™. Smart Steering detects the rider’s steering input as well as the speed of operation and automatically increases engine speed to provide additional thrust. The advanced steering technology continuously monitors engine rpm to determine if the craft is being operated at a low or high speed. If the speed is low, the system does not operate. If the speed is high, the system will operate, even if the throttle has been released and the engine has returned to idle.