1974 Kawasaki S1 250

Make Model	Kawasaki S1 250SS MKI
Year	1974 - 75
Engine	Two stroke, transverse three cylinder,
Capacity	249 cc / 15.2 cu-in
Bore x Stroke	45 x 52.3mm
Cooling System	Air cooled
Compression Ratio	7,3:1
Induction	3x Mikuni VM22SC, Ø 22 mm carburetor
Ignition	Battery and coil
Starting	Kick
Max Power	32 hp / 23.8 kW @ 8 500 rpm
Max Torque	2.54 m-kg / 18.3 lb-ft @ 7 000 rpm
Transmission	5 Speed
Final Drive	Chain
Frame	Double tubular steel cradle
Front Suspension	Telescopic hydraulic forks
Rear Suspension	Dual shocks, Swing arm
Front Brakes	180mm Drum
Rear Brakes	180mm Drum
Front Tyre	3.00 -18
Rear Tyre	3.25 -18
Rake	28°
Trail	110 mm / 4.3 in
Dimensions	Length 2020 mm / 79.5 in Width 820 mm / 32.3 in
Wheelbase	1585 mm / 62.4 in
Ground Clearance	175 mm / 6.9 in
Dry Weight	149.5 kg / 326 lbs
Wet Weight	160 kg / 348 lbs
Fuel Capacity	15 Litres / 3.9 US gal
Road Test	1974 S1 250 Group Test

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 @ 8000 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) @ 8000 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.

Kawasaki S1 250SS