Sportbikes
2021Kawasaki Ninja 400
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The 2021 Kawasaki Ninja 400 is an entry-level sport bike perfectly suited for new riders and commuters seeking an affordable, nimble machine. Its lightweight 399cc twin-cylinder engine delivers approachable power with excellent fuel efficiency, while the assist and slipper clutch make it forgiving in urban riding. Known for its sleek Ninja styling and reliable performance, it strikes an ideal balance between sportiness and practicality.
- Capacity
- 399.0 ccm
- Engine
- Parallel Twin, four-stroke
- Gearbox
- 6-speed
- Dry weight
- 167.0 kg
- Seat height
- 785 mm
- Power
- 44.8 HP (33.0 kW)
What’s new for the 2021 Kawasaki Ninja 400
vs the 2020| Spec | 2020 | 2021 |
|---|---|---|
| Power | 44.0 HP (32.1 kW) @ 9500 RPM | 44.8 HP (33.0 kW) |
| Front suspension | Telescopic fork | 41mm hydraulic telescopic fork |
| Rear suspension | Bottom-link Uni-Trak®, swingarm adjustable preload | Horizontal back-link with adjustable spring preload |
| Front brakes | Single disc. Hydraulic. Two-piston calipers. | Single disc. Single petal-type disc with 2-piston calipers. Optional ABS. |
| Rear brakes | Single disc. Hydraulic. Two-piston calipers. | Single disc. Single petal-type disc with single-piston caliper. Optional ABS. |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- A lightweight sport bike for spirited canyon rides, commuting, and entry-level track days rather than long-distance touring.
- Built for
- Nimble, approachable, and revvy parallel-twin sportbike that punches above its 399cc for grins without intimidating newer riders.
- Not ideal for
- Not for riders wanting big-bore highway punch, two-up touring range (tiny 3.7L tank), or any off-road use.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usRange and running costs
Worked out in your browser - nothing is sent to usBased on the published US (EPA-style) fuel economy estimate and tank size. Real-world figures depend on how and where you ride, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.
Engine
- Capacity
- 399.0 ccm
- Power
- 44.8 HP (33.0 kW)
- CO2 Emissions
- 81 CO2 g/km
- EPA Certificate No.
- MKAXC.399AAB-011
- EPA Est. Fuel Consumption
- 3.45 L/100km (68.2 US mpg)
- EPA CO Emissions
- 3.6 CO g/km
- Torque
- 38.0 Nm (3.9 kgf-m) @ 8000 RPM
- Engine type
- Parallel Twin, four-stroke
- Power/weight ratio
- 0.2683 HP/kg (dry)
- Bore x stroke
- 70.0 x 51.8 mm
- Compression
- 11.5:1
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- TCBI w/digital advance
- Aspiration
- Naturally aspirated
- Valves per cylinder
- 4
- Lubrication system
- Forced lubrication, wet sump
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Assist and Slipper Clutch
Performance
- 0-60 mph
- 4.63 seconds
Dimensions & weight
- Wheelbase
- 1369 mm
- Overall length
- 1989 mm
- Overall width
- 711 mm
- Overall height
- 1120 mm
- Seat height
- 785 mm
- Dry weight
- 167.0 kg
- Wet weight
- 168.0 kg
- Fuel capacity
- 14.00 litres
- Ground clearance
- 140 mm
- Oil capacity
- 2.30 litres
Chassis & suspension
- Frame
- Trellis, high-tensile steel
- Front suspension
- 41mm hydraulic telescopic fork
- Rear suspension
- Horizontal back-link with adjustable spring preload
- Front wheel travel
- 119 mm
- Rear wheel travel
- 130 mm
- Rake (fork angle)
- 24.7°
- Trail
- 91 mm
Brakes & wheels
- Front brakes
- Single disc. Single petal-type disc with 2-piston calipers. Optional ABS.
- Front brakes diameter
- 310 mm
- Rear brakes
- Single disc. Single petal-type disc with single-piston caliper. Optional ABS.
- Rear brakes diameter
- 220 mm
- ABS
- Optional
- Front tyre
- 110/70-17
- Rear tyre
- 150/70-17
Other
- Color options
- Pearl Blizzard White, Metallic Spark Black/ Metallic
- Warranty
- 12
- Comments
- Small windscreen. Economical Riding Indicator.
- Fuel Tank Material
- Metal
Specs last verified against published sources: .
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2014 | 2017 | 2020 | 2021 | 2022 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 399 cc | 399 cc | 399 cc | 399 cc | 399 cc | 398 cc |
| Dry weight | 167 kg | — | 167 kg | 167 kg | 167 kg | — |
| Seat height | 805 mm | 785 mm | 785 mm | 785 mm | 785 mm | 785 mm |
| Fuel capacity | 15 L | 14 L | 14 L | 14 L | 14 L | 14 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Kawasaki Ninja 400?
The 2021 Kawasaki Ninja 400 has a Capacity of 399.0 ccm (24.35 cubic inches).
What engine power does the Kawasaki Ninja 400 have?
The 2021 Kawasaki Ninja 400 has a Power of 44.8 HP (33.0 kW).
How many gears does the Kawasaki Ninja 400 have?
The 2021 Kawasaki Ninja 400 has a Gearbox of 6-speed.
What is the torque of the Kawasaki Ninja 400?
The 2021 Kawasaki Ninja 400 has a Torque of 38.0 Nm (3.9 kgf-m or 28.0 ft.lbs) @ 8000 RPM.
How much does the Kawasaki Ninja 400 weigh?
The 2021 Kawasaki Ninja 400 has a Dry weight of 167.0 kg (368.2 pounds).
Shop this bike
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The 2021 Kawasaki Ninja 400 motorcycle is a powerful and agile sports bike that delivers an exhilarating riding experience. With its 399cc parallel-twin engine, this bike boasts impressive performance and exceptional handling, making it a top choice for riders looking for a thrilling ride. The sleek and stylish design of the Ninja 400, combined with its advanced technology features, sets it apart from other bikes in its class. Whether you're a new rider or a seasoned motorcyclist, the Ninja 400 offers an impressive combination of power, precision, and style.
Overall, the 2021 Kawasaki Ninja 400 motorcycle is a fantastic choice for anyone in the market for a high-performance sports bike. Its powerful engine, exceptional handling, and stylish design make it a standout option in its class. Whether you're hitting the open road or tackling twisty turns, the Ninja 400 is sure to provide an adrenaline-pumping experience for riders of all skill levels.
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