| MODEL | KAWASAKI EX 400 NINJA 1987 - 1990 |
| Year | 1987 - 1990 |
| Engine Type | Four stroke, parallel twin, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 398 cc / 24.3 cu in |
| Bore X Stroke | 70 x 51.8 mm |
| Compression Ratio | 10.7:1 |
| Cooling System | Liquid cooled |
| Max Power | 36.5 kW / 50 hp @ 10500 rpm |
| Max Torque | 3.6 kgf-m (35.3 Nm) @ 9000 rpm |
| Ignition | TCI (transistor controlled ignition) |
| Induction | Carburettor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6-speed |
| Clutch | Wet, multiple discs, cable operated |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Iron, double cradle |
| Front Suspension | 38 mm telescopic forks, 130 mm / 5.1 in travel |
| Rear Suspension | Swinging arm, single shock adjustable for spring preload, 100 mm / 3.9 in travel |
| Front Brakes | Twin disc |
| Rear Brakes | Single disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 177 kg / 390 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 |
| Rear Tyre | 130/70-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 16 litres / 3.9 US gal |
| Fuel Consumption | — |
| Top Speed | — |
A 398 cc liquid-cooled parallel twin sport bike, sold as the GPX400R and EX400 Ninja, with DOHC and four valves per cylinder. It used carburettors and a six-speed gearbox on an iron double-cradle frame, and was rated at about 50 hp. This earlier version is distinguished from the 1991-95 model mainly by its twin front disc brakes.
