Page 131 of Kawasaki Motorcycles by Kawasaki USA

2006 Kawasaki Product Sales Guide. EX650A6F 4 Simplified cooling system routes coolant through the engine cases to the cylinder and head to reduce external plumbing. Compact radiator with high-density core provides efficient cooling. Oil jets located in the rod big-ends direct oil to the undersides of the pistons for added cooling. Large-bore 38 mm throttle bodies feature sub-throttle valves and fine-atomizing injectors to deliver instant cold starting, excellent power characteristics and good fuel economy. ECU controlled sub-throttles ensure smooth, linear power characteristics. Auto-fast idle system simplifies starting and ensures the catalyser reaches optimum temperature quickly. The combination of efficient fuel injection and a 3-way catalyser inside the muffler make for very low emissions which pass the stringent Euro-III regulations 180 crankshaft drives a balancer shaft for silky smooth engine operation. Semi-dry sump design reduces engine height. There are two oil pumps; one scavenge pump and one pressure pump. Scavenged oil is stored in transmission cavity, away from the crankshaft area. Triangular layout of the crankshaft and transmission shafts makes the engine very short front-to-back. Transmission input shaft, output shaft and change drum are contained in a cassette -style package that both allows a compact layout and facilitates transmission maintenance chores.

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