In 1972, Kawasaki unveiled the Z1, marking a revolutionary step in performance for motorcycles. During its time, it claimed numerous records and quickly became revered platform within the world of racing. With the retro-craze in full swing, designers were wise to tap the rich heritage of the now iconic Z1, which has inspired the contemporary Z900-based 2018 Kawasaki Z900RS in more than just appearances. 1. The 2018 Kawasaki Z900RS’s inline-4 has been optimized for torque and it’s an absolute blast.