The Kawasaki ZX-R is a legendary line of sportbikes from Kawasaki. It first appeared in 1985 and has since been released in several iterations. Most notably, the ZX-R is powered by an in-line four-cylinder engine. These bikes have a reputation for being powerful, fast, and reliable. The current iteration of the ZX-R is the Kawasaki Ninja ZX-10R, released in 2011.