2021 Kawasaki Ninja® ZX™-6R RULE THE TRACK. RUN THE STREETS. The Ninja® ZX™-6R motorcycle boasts a potent 636cc engine, advanced electronics and a lightweight chassis. The “636” has been optimized for the street and the track, offering an exhilarating experience in a wide range of riding situations. Features may include: POWER FLEX ON THE STREET &...