| MODEL | SUZUKI GSX 400E-S 1984 - 1986 |
| Year | 1984 - 1986 |
| Engine Type | Four stroke, parallel twin, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 398 cc / 24.3 cu in |
| Bore X Stroke | 67 x 56.6 mm |
| Compression Ratio | 10.5:1 |
| Cooling System | Air cooled |
| Max Power | 32.8 kW / 44 hp @ 9500 rpm |
| Max Torque | 36.3 Nm / 3.7 kgf-m / 26.8 lb-ft @ 8000 rpm |
| Ignition | Transistorized |
| Induction | 2 x Mikuni BS34SS carburetors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6 speed constant mesh |
| Clutch | Wet multiple plates, coil spring |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double cradle |
| Front Suspension | Air assisted telescopic forks |
| Rear Suspension | Dual shocks, preload adjustable |
| Front Brakes | Single disc |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 2105 mm / 82.9 in |
| Overall Width | 755 mm / 29.7 in |
| Overall Height | 1070 mm / 42.1 in |
| Seat Height | 755 mm / 29.7 in |
| Wheelbase | 1415 mm / 55.7 in |
| Ground Clearance | 145 mm / 5.7 in |
| Dry Weight | 176 kg / 388 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00S-18 4PR |
| Rear Tyre | 3.50S-18 4PR |
| FUEL SYSTEM | |
| Fuel Capacity | 16 Litres / 4.2 US gal / 3.5 Imp gal |
| Fuel Consumption | 5.2 L/100 km / 19.1 km/l / 45 US mpg / 64 Imp mpg |
| Top Speed | 158 km/h / 98 mph |
The small-fairing GSX400S carried on after the plain E left most markets in 1984, running to about 1986 with the same air-cooled twin. A period Canadian test found it a friendly learner and commuter bike with smooth, responsive power, but criticised soft rear damping, high-speed stability, narrow tyres and a mushy anti-dive front brake. This version also lists narrower tyres than the early S.
