This bike, evolution of the 350 S2, is still a legend. It was "THE" bike of the french "Coupe Kawasaki".
How many future champions began with this triple ? Moreover, the S3 (and the KH) dominated without question "Promosports 500" until 1980 yielding its place to Yamaha 350 RDLC.
| Engine type : | 2-stroke, in line 3-cylinder, piston reed valve, air-cooled |
| Capacity : | 400.4 cm3 |
| Bore x Stroke : | 56.9 x 52.3 mm |
| Max power/rpm : | 42 HP at 7000 rpm |
| Max torque : | 4.3 m.kg at 6500 rpm |
| Compression ratio : | 6.5 : 1 |
| Fuel system : | 3 Mikuni carburettors - Type : VM 26 SC |
| Ignition : | battery - 12 V |
| Gear box : | 5 speed |
| Tyres : | Front : 3.25 X 18" – Rear : 3.50 X 18" |
| Weight (empty) : | 159 kg |
| Max speed : | 170 km/h |
