Kawasaki S3 400SS MKII




Make Model

Kawasaki S3 400SS MKII




Two stroke, transverse three cylinder


399 cc / 24.3 cu-in
Bore x Stroke 57 x 52.3 mm
Cooling System Air cooled
Compression Ratio 6,5:1


3x Mikuni VM26SC, Ø 26 mm carbs


Battery and coil 
Starting Kick

Max Power

42 hp @ 7000 rpm

Max Torque

4.32 m-kg @ 6500rpm


5 Speed
Final Drive Chain
Frame Double tubular steel cradle

Front Suspension

Telescopic Hydraulic forks

Rear Suspension

Dual shocks, Swing arm

Front Brakes

Single 277mm disc

Rear Brakes

180mm Drum

Front Tyre

3.25 -18

Rear Tyre

3.50 -18
Wheelbase 1364 mm / 53.7 in
Ground Clearance 153 mm / 6.0 in

Wet Weight

160 kg / 353 lbs

Fuel Capacity 

14 Litres / 3.7 US gal



In 1974, the 400 S3 replaces the 350 S2. Upon arrival, the 400 S3 also replaces the 350 S2 cuts in Kawasaki. This machine is not obtained by a simple réalésage engine, but the purpose of deep reflection.

With the 400, Kawasaki did not seek the maximum power. Despite an engine capacity above and carburetors largest (from 24 to 26 mm in diameter, the power falls to 42 hp, but it is obtained 1000 rpm lower. This is the couple that benefits of increased displacement, it rose from 4.00 to 4.32 mkg mkg, but as power, it is obtained 1000 rpm lower. Kawasaki's efforts have made the 400 S3 exploitable that 350 S2. Engaging benefits a disk and pump oil is also reviewed.

The chassis has also been a trend to provide greater stability through increased hunting and the wheelbase.

Towards comfort, the engine is mounted in part through silentblocs. The machine is therefore less sensitive to vibration. The general line, even if the machine is always easily identifiable thanks to the 3 exhaust systems, is now much more classic.

In 1975, Kawasaki S3A markets. The changes are primarily aesthetic.

1975 also lacks the end of the career of this medium-size machine. In 1976, a victim of the oil crisis, it is replaced by the 400 KH.