| MODEL | SUZUKI GS 400S 1984 - 1986 |
| Year | 1984 - 1986 |
| Engine Type | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 399 cc / 24.3 cu in |
| Bore X Stroke | 67 x 56.6 mm |
| Compression Ratio | 10.0:1 |
| Cooling System | — |
| Max Power | 29 kW / 39 hp @ 9500 rpm |
| Max Torque | 31.4 Nm / 3.2 kgf-m / 23.2 lb-ft @ 3000 rpm |
| Ignition | Transistorized |
| Induction | Mikuni BS34SS carburetors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6 Speed constant mesh |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic, coil spring, oil damped |
| Rear Suspension | Dual dampers, coil spring, 5-way adjustable |
| Front Brakes | Single disc |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 2105 mm / 82.9 in |
| Overall Width | — |
| Overall Height | 1160 mm / 45.7 in |
| Seat Height | 755 mm / 29.7 in |
| Wheelbase | 1420 mm / 55.9 in |
| Ground Clearance | 145 mm / 5.7 in |
| Dry Weight | 177 kg / 390 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00S18-4PR |
| Rear Tyre | 3.50S18-4PR |
| FUEL SYSTEM | |
| Fuel Capacity | 16 Litres / 4.8 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The mid-1980s road 400 twin, using a four-valve engine in place of the old two-valve unit. For 1984 it received gold wheels, new paint and a nose fairing. Reviewers found it smooth and practical, well suited to new or smaller riders.
