| MODEL | KAWASAKI ZX 900 NINJA 1989 - 1990 |
| Year | 1989 - 1990 |
| Engine Type | Four-stroke, transverse four-cylinder, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 908 cc / 55.4 cu in |
| Bore X Stroke | 72.5 x 55 mm |
| Compression Ratio | 11.0:1 |
| Cooling System | Liquid-cooled |
| Max Power | 108 hp / 80.5 kW @ 9,500 rpm |
| Max Torque | 8.7 kgf-m / 62.9 lb-ft @ 8,500 rpm |
| Ignition | Battery ignition, fully electronic |
| Induction | 4x 34 mm Keihin CVK34 carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Iron, double cradle |
| Front Suspension | 41 mm telescopic forks, air-assisted, four-way anti-dive |
| Rear Suspension | Uni-Trak air-assisted single shock, four-way adjustable damping |
| Front Brakes | 2x 300 mm discs, 4-piston calipers |
| Rear Brakes | Single 250 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 790 mm / 31.1 in |
| Wheelbase | 1425 mm / 56.1 in |
| Ground Clearance | — |
| Dry Weight | 228 kg / 502 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 120/70-17 |
| Rear Tyre | 150/70-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 22 litres / 5.8 US gal |
| Fuel Consumption | 40.8 mpg (average) |
| Top Speed | 247.8 km/h / 154 mph |
The 1989-90 ZX 900 Ninja moved to a 17-inch front wheel with 41 mm air-assisted forks and 300 mm front discs with four-piston calipers. In 1990 the wheels were widened for fatter tyres, and the page treats that year as an update rather than a replacement. It keeps the 908 cc four and single-shock Uni-Trak rear end of the line.
