The 1972–1975 Kawasaki 900 Z1 ("Super Four") was a groundbreaking Japanese motorcycle, featuring a 903cc air-cooled, inline-four engine with a Double Overhead Camshaft (DOHC) design. As the first high-performance, mass-produced Japanese bike with DOHC, it produced 82 hp, achieved speeds over 130 mph, and revolutionized the superbike market.
