| MODEL | KAWASAKI S1 250SS MKI 1972 - 1973 |
| Year | 1972 - 1973 |
| Engine Type | Two stroke, transverse three cylinder |
| Displacement / Capacity | 249 cc / 15.2 cu in |
| Bore X Stroke | 45 x 52.3 mm |
| Compression Ratio | 7.3:1 |
| Cooling System | Air cooled |
| Max Power | 32 hp / 23.8 kW @ 8500 rpm |
| Max Torque | 2.54 m-kg / 18.3 lb-ft @ 7000 rpm |
| Ignition | Battery and coil |
| Induction | 3 x Mikuni VM22SC, 22 mm carburettors |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double tubular steel cradle |
| Front Suspension | Telescopic hydraulic forks |
| Rear Suspension | Dual shocks, swing arm |
| Front Brakes | 180 mm drum |
| Rear Brakes | 180 mm drum |
| DIMENSION SPECS | |
| Overall Length | 2020 mm / 79.5 in |
| Overall Width | 820 mm / 32.3 in |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1585 mm / 62.4 in |
| Ground Clearance | 175 mm / 6.9 in |
| Dry Weight | 149.5 kg / 326 lb |
| Wet Weight | 160 kg / 348 lb |
| WHEEL SPECS | |
| Front Tyre | 3.00 - 18 |
| Rear Tyre | 3.25 - 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 3.9 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The S1 250SS MKI was Kawasaki's small air-cooled two-stroke triple of the early 1970s, with a distinctive seat-and-tail fairing. Its 249 cc engine gave modest, peaky performance, and the bike relied on drum brakes and a basic chassis. A magazine reviewer found its power comparable to rival 250s of the period, but with higher internal friction and lower torque.
