| MODEL | KAWASAKI S3 400SS MKII 1974 |
| Year | 1974 |
| Engine Type | Two stroke, transverse three cylinder |
| Displacement / Capacity | 399 cc / 24.3 cu in |
| Bore X Stroke | 57 x 52.3 mm |
| Compression Ratio | 6.5:1 |
| Cooling System | Air cooled |
| Max Power | 42 hp @ 7000 rpm |
| Max Torque | 4.32 m-kg @ 6500 rpm |
| Ignition | Battery and coil |
| Induction | 3 x Mikuni VM26SC, 26 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 | Single 277 mm disc |
| Rear Brakes | 180 mm drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1364 mm / 53.7 in |
| Ground Clearance | 153 mm / 6.0 in |
| Dry Weight | — |
| Wet Weight | 160 kg / 353 lb |
| WHEEL SPECS | |
| Front Tyre | 3.25 - 18 |
| Rear Tyre | 3.50 - 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 14 Litres / 3.7 US gal |
| Fuel Consumption | About 27 mpg cruising at 70-80 mph |
| Top Speed | 108.2 mph |
The S3 400SS MKII replaced the 350 S2 in 1974 with a larger, more torquey 399 cc two-stroke triple. Kawasaki went for usable power rather than peak output, and the longer wheelbase and rubber-mounted engine improved stability and smoothness. It has a single front disc where the earlier S2 had drum brakes, and reviewers praised its smooth, fast delivery while criticising its thirst and short tank range.
