Kawasaki S1 Mach I

The Kawasaki Mach I (model designation S1) was a 250 cc (15 cu in) Kawasaki motorcycle made 1972 through 1975.

Kawasaki S1 Mach I

1972 Kawasaki S1
Manufacturer	Kawasaki
Parent company	Kawasaki Heavy Industries
Production	1972-1975
Predecessor	Kawasaki A1 Samurai
Successor	Kawasaki KH250
Class	Standard
Engine	249 cc (15.2 cu in) Air-cooled 3-cylinder, two-stroke
Bore / stroke	45.0 mm × 52.3 mm (1.8 in × 2.1 in)
Top speed	152-154 km/h (95-96 mph)[citation needed]
Power	(1972)32bhp at 8,000 rpm -(1974)28 bhp (33.5 kilowatts) at 7,500 rpm[citation needed]
Torque	30.7 lb-ft at 7000 rpm[citation needed]
Transmission	Chain driven 5-speed, 1 down-4 up pattern
Suspension	Inner spring telescopic front fork, three-position spring preload adjustable shock absorber and swing arm (rear)
Wheelbase	54inch
Dimensions	L: 79,5inch W: 32,3inch
Seat height	31,5inch
Weight	339lb149.5 kg (330 lb)[citation needed] (dry) 348lb 160 kg (350 lb)[citation needed] (wet)
Fuel capacity	14 L (3.2 gallon)
Related	Kawasaki S2 Mach II, Kawasaki H1 Mach III, Kawasaki H2 Mach IV

History

The Mach I was a direct result of the widespread success of the Kawasaki H1 Mach III 500 cc introduced in 1969. The Mach I's engine was a three-cylinder two-stroke with an engine displacement of 249 cc (15.1 cubic inches) which produced 32 bhp at 8,000 rpm, a power-to-weight ratio of 1 hp (0.75 kW) to every 11.8 pounds.^{[citation needed]} The S1 Mach I replaced the twin Kawasaki A1 Samurai 250 with its twin-cylinder, Kawasaki rotary disc valve engine which produced 31 hp (23 kW) at 8,000 rpm.^{[citation needed]}

The S1 Mach I emerged nearly one year after its bigger brother, the S2 Mach II 350, and from the development success of the Kawasaki H1 Mach III. It was essentially the same motorcycle as its larger brother with less displacement. It had a separate handlebar holder and steering friction damper. Its successor, the KH250, was essentially the same bike with a different name, was marketed from 1976 to 1981.