The 1976 JS400 was popular among thrill-seeking recreational riders and racers. The 1977 JS440 offered more power and performance. It was one of Kawasaki's longest-selling models. In 1982, Kawasaki responded to market demand for more performance with the JS550. The 550 featured a newly designed high-capacity mixed-flow pump driven by a more powerful 531cc engine. The 550 introduced an automatic rev limiter to prevent engine damage when the pump cavitates. The JS550 introduced underwater exhaust for quieter operation to the stand-up Kawasaki.
