1981 Suzuki GSX400S

Make Model	Suzuki GSX 400E - S
Year	1981 - 83
Engine	Four stroke, parallel twin, DOHC, 4 valves per cylinder.
Capacity	398 cc / 24.3 cu in
Bore x Stroke	67 x 56.6 mm
Cooling System	Air cooled
Compression Ratio	10.5:1
Lubrication	Wet sump
Oil Capacity	3.0 Litres / 3.2 US qt / 2.6 Imp qt
Induction	2 x Mikuni BS34SS carburetors
Ignition	Transistorized
Starting	Electric
Max Power	32.8 kW / 44 hp @ 9500 rpm
Max Torque	36.3 Nm / 3.7 kgf-m 26.8 lb-ft @ 8000 rpm
Clutch	Wet multiple plates, coil spring
Transmission	6 speed constant mesh
Final Drive	Chain
Gear Ratio	1st 2.461 / 2nd 1.777 / 3rd 1.380 / 4th 1.125 / 5th 0.961 / 6th 0.851:1
Primary Drive Ratio	2.714
Secondary Drive Ratio	2.933
Frame	Double cradle
Front Suspension	Air assisted telescopic forks
Rear Suspension	Dual shocks, preload adjustable
Front Brakes	Single disc
Rear Brakes	Drum
Front Tyre	3.60S-18 4PR
Rear Tyre	4.10S-18 4PR
Caster	27.5⁰
Trail	102 mm / 4.02 in
Dimensions	Length 2105 mm / 82,9 in Width 755 mm / 29,7 in Height 1070 mm / 42,1 in
Wheelbase	1415 mm / 55,7 in
Dry Weight	175 kg / 386 lbs
Fuel Capacity	16 Litres / 4.2 US gal / 3.5 Imp gal
Consumption Average	5.2 L/100 km / 19.1 km/l / 45 US mpg / 64 Imp mpg
Standing ¼ Mile	15.2 sec
Top Speed	158 km/h / 98 mph

The air-cooled twin GSX400E (frame code: GK51C) with four valves per cylinder was presented in Europe in 1980, replacing the GS425 with two valves per cylinder. The style of the middle range street sports bike had the same styling as its smaller brother GSX250E, released simultaneously.

A version with a small cockpit fairing, GSX400S (internal model code: GK53C), was presented in 1980.

In 1983 the GSX400E got new type of cast wheels and a black-coated engine. Probably even the instrument panel got a new design. The paint scheme was new but mechanically the model remained unchanged.

As earlier, a model version called GSX400S with a small fairing was offered for those who wanted some protection against the wind.

Suzuki GSX 400E-S