| MODEL | KAWASAKI NINJA 400 2021 |
| Year | 2021 |
| Engine Type | Four stroke, parallel twin, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 399 cc / 24.3 cu in |
| Bore X Stroke | 70.0 x 51.8 mm |
| Compression Ratio | 11.6:1 |
| Cooling System | Liquid cooled |
| Max Power | 36 kW / 49 hp @ 10000 rpm |
| Max Torque | 38 Nm / 3.9 kgf-m @ 8000 rpm |
| Ignition | TCBI with digital advance / electric |
| Induction | Fuel injection, 32 mm x 2 Keihin |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Forced lubrication, wet sump |
| Gear Box | 6-speed |
| Clutch | Wet, cable-operated |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Trellis, high-tensile steel |
| Front Suspension | 41 mm telescopic fork, 120 mm / 4.7 in travel |
| Rear Suspension | Bottom-Link Uni-Trak, gas-charged shock with adjustable preload, 130 mm / 5.1 in travel |
| Front Brakes | Single semi-floating 310 mm disc, single balanced actuation dual-piston |
| Rear Brakes | Single 220 mm disc, dual-piston |
| DIMENSION SPECS | |
| Overall Length | 1990 mm / 78.3 in |
| Overall Width | 710 mm / 27.9 in |
| Overall Height | 1120 mm / 44.1 in |
| Seat Height | 785 mm / 30.9 in |
| Wheelbase | 1370 mm / 53.9 in |
| Ground Clearance | 140 mm / 5.5 in |
| Dry Weight | — |
| Wet Weight | 166 kg / 366 lb |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 M/C 54S |
| Rear Tyre | 150/60R17 M/C 66H |
| FUEL SYSTEM | |
| Fuel Capacity | 14 litres / 3.7 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 2021 Ninja 400 is a lightweight sportbike on the same 399 cc twin and trellis-frame platform, aimed at both new and experienced riders. The page stresses the class-leading displacement and smooth, low-end-heavy power, plus a low seat height and LED headlights. Its styling follows the supersport Ninja lineup, and the page's colour text refers to the 2020 colourways.
