Kawasaki S1 Mach I

The Kawasaki S1 Mach I was a 250 cc three-cylinder two-stroke motorcycle that Kawasaki made from 1972 through 1975. It grew directly out of the success of the 500 cc H1 Mach III of 1969 and was essentially the same motorcycle as its bigger brother, the 350 cc S2 Mach II, which had appeared nearly a year earlier, only with less displacement. Its 249 cc engine produced 32 bhp at 8,000 rpm, a power-to-weight ratio of one horsepower for every 11.8 pounds, and it replaced the twin-cylinder Kawasaki A1 Samurai 250, whose rotary disc valve engine made 31 hp. It had a separate handlebar holder and a steering friction damper. Its successor, the KH250, was essentially the same bike under a different name and was sold from 1976 to 1981.