Page 152 of Kawasaki Motorcycles by Kawasaki USA

The electronic fuel injection system, controlled by dual throttle valves, ensures silky smooth response and easy-to-control torque characteristics. Automotive-type fine-atomising injectors improve performance, fuel economy and emissions. An auto-fast idle system is equipped with an rpm feedback relay ensuring a fixed (ideal) engine speed in all starting conditions. (The feedback is used to control the sub-throttles to obtain the desired rpm.) Curved intake tracts provide an extremely efficient path for intake flow. Ports narrow as they reach the combustion chamber, increasing intake flow speed for more efficient filling. The result of the highly intake efficiency is improved torque. Long intake tracts extend well into the air cleaner box. The longer path improves low-end response. Returnless-type pump inside the fuel tank prevents fuel starvation during hard braking or acceleration. No return fuel line increases reliability. Redesigned crankshaft and gear-driven balancer are matched to the new longer stroke for smooth performance. Like all Kawasaki V-twins, the VN900 engine uses a single crankpin for best strength and strong power feeling. Lightweight, nut-less connecting rods like those on the VN2000 contribute to low vibration levels.

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