The Kawasaki ER-6 Ninja 650R, AKA ER-6f or EX-6 motorcycle has been sold since 2006. It is a middleweight parallel-twin engined road bike with a low centre of gravity. The ER-6 fits into Kawasaki's sportbike lineup and has acquired various updates like new bodywork, mirrors, gauges, lighting and a new tune on the 649cc engine over the years.The new Ninja 650 also comes with an Economical Riding Indicator which shows when the bike is running with economical fuel consumption.