 Kawasaki introduced the Z1 (900) motorcycle in 1972 as the first of the Kawasaki Z series, with four cylinders, dual overhead camshafts and , followed by a 1015 cc version designated Z1000.In 2003 Kawasaki introduced a completely revamped 30-year anniversary edition of the Z1000.It used a modified engine from the Kawasaki ZX-9R, and was bored out by 2.2 mm resulting in bigger displacement, more low-RPM torque, and only a slight power loss of 4 bhp from the original ZX9.