Page 130 of Kawasaki Motorcycles by Kawasaki USA

2006 Kawasaki Product Sales Guide. EX650A6F 3 MODEL FEATURES Engine The key to the Ninja 650Rs compact size is its engine. Our engineers knew that, for the trim package they were pursuing, an In-line Four would be too wide and a V-Twin too long. The only engine design that offered both good power and the requisite compactness was a Parallel Twin. The Ninja 650Rs 649 cc liquid-cooled power unit is far and away the most compact engine in its category, smaller even than that of the EX500 quite a feat, considering that the Ninja 650R displaces 150cc more than the EX500. The compact design and surprising performance is the result of an engine loaded with high technology. Ninja technology and know-how abounds in the Ninja 650R, and that explains why this compact and lightweight machine can outperform so many of its middleweight competitors. All-new liquid-cooled, DOHC, 8-valve 649 cm 3 Parallel Twin with fuel injection delivers smooth, responsive performance, especially in the low and medium rpm ranges. Plated, linerless aluminium cylinders are lightweight, and the narrow cylinder spacing reduces engine width. EX650 EX500

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