2003 Kawasaki Ninja 500R, Rebuilder - Kawasaki's NINJA 500R sportbike is not only versatile it's also one of the best buys in motorcycling. You just can't argue with a bike that provides plenty of power, a comfortable riding position and Kawasaki's stellar sportbike styling. Novice and experienced riders alike will appreciate the 500R's liquid-cooled, inline twin-cylinder four-stroke engine. With dual overhead cams actuating four valves per cylinder, the snappy motor is user friendly and inspirational. Indeed, exploring the top end of this engine's rev range is entertaining for even the most seasoned of riders.