| MODEL | SUZUKI GS 425 1978 |
| Year | 1978 |
| Engine Type | Four stroke, parallel twin cylinder, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 423 cc / 25.8 cu in |
| Bore X Stroke | 67 x 60 mm |
| Compression Ratio | 9.1:1 |
| Cooling System | Air cooled |
| Max Power | 29.8 kW / 40 hp @ 7000 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | 2 x 34 mm Mikuni carburetors |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | Wet multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic fork |
| Rear Suspension | Twin shocks, coil spring over |
| Front Brakes | Single disc, 11 in |
| Rear Brakes | Drum, 7 in |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 787 mm / 31 in |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 173 kg / 382 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00-18 |
| Rear Tyre | 3.75-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 4.0 US gal / 3.3 Imp gal |
| Fuel Consumption | — |
| Top Speed | 101.8 mph (road test) |
The GS400 enlarged by 23 cc and restyled, giving a little more power and a faster quarter-mile. It kept the smooth two-valve DOHC twin and 6-speed gearbox. Testers liked the narrow, nimble handling but found the riding position cramped.
