The faired Kawasaki Ninja 650R, also known as the ER-6f, and its un-faired sister model ER-6n were introduced in 2006 by Kawasaki. They are middleweight, parallel-twin engined motorcycles, designed for normal use on paved roads. They have modern styling and features, with low-seating ergonomics, a low center of gravity, and respectable, manageable power output. The design was intended to appeal to a wide-ranging audience from newcomers to seasoned riders. The engine is relatively unusual in employing a 180 degree crankshaft. This results in an uneven firing interval (180 degrees, 540 degrees) which gives the engine note a distinctive "throbbing" quality.
