Sportbikes
2021Kawasaki Ninja 400 KRT
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The 2021 Kawasaki Ninja 400 KRT is an entry-level sportbike designed for new and younger riders seeking an accessible gateway into sport motorcycle riding. Its lightweight 399cc twin-cylinder engine delivers manageable power with modern features like assist and slipper clutch, making it ideal for learning fundamental riding skills. Known for its nimble handling, fuel efficiency, and approachable performance, the Ninja 400 KRT strikes the perfect balance between excitement and control for novice riders.
- Capacity
- 399.0 ccm
- Engine
- Parallel Twin, four-stroke
- Gearbox
- 6-speed
- Dry weight
- 165.0 kg
- Seat height
- 785 mm
- Power
- 44.8 HP (33.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built as an approachable sport bike for mixed commuting, weekend twisty-road fun, and occasional longer rides rather than dedicated track use.
- Built for
- A friendly, torquey parallel twin with a trellis frame and slipper clutch gives confident, predictable handling that rewards smooth inputs over outright aggression.
- Not ideal for
- Not the right choice for riders seeking serious off-road capability or those wanting flagship superbike-level top-end power and track performance.
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 usEngine
- Capacity
- 399.0 ccm
- Power
- 44.8 HP (33.0 kW)
- Torque
- 38.0 Nm (3.9 kgf-m) @ 8000 RPM
- Engine type
- Parallel Twin, four-stroke
- Power/weight ratio
- 0.2715 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
- Lubrication system
- Forced lubrication, wet sump
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Assist and Slipper Clutch
Dimensions & weight
- Wheelbase
- 1370 mm
- Overall length
- 1990 mm
- Overall width
- 710 mm
- Overall height
- 1120 mm
- Seat height
- 785 mm
- Dry weight
- 165.0 kg
- Fuel capacity
- 14.00 litres
- Ground clearance
- 140 mm
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. Petal-type disc with 2-piston calipers. Optional ABS.
- Front brakes diameter
- 310 mm
- Rear brakes
- Single disc. Petal-type disc with single-piston caliper. Optional ABS.
- ABS
- Optional
- Front tyre
- 110/70-17
- Rear tyre
- 150/70-17
Other
- Color options
- Lime Green/Ebony/Pearl Blizzard White
- Warranty
- 12
- Comments
- Special Kawasaki Racing Team (KRT) edition. Small windscreen. Economical Riding Indicator.
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 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|
| Capacity | 399 cc | 399 cc | 399 cc | 399 cc |
| Dry weight | 165 kg | 165 kg | 166 kg | 165 kg |
| Seat height | 785 mm | 785 mm | 785 mm | 785 mm |
| Fuel capacity | 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 KRT?
The 2021 Kawasaki Ninja 400 KRT has a Capacity of 399.0 ccm (24.35 cubic inches).
What engine power does the Kawasaki Ninja 400 KRT have?
The 2021 Kawasaki Ninja 400 KRT has a Power of 44.8 HP (33.0 kW).
How many gears does the Kawasaki Ninja 400 KRT have?
The 2021 Kawasaki Ninja 400 KRT has a Gearbox of 6-speed.
What is the torque of the Kawasaki Ninja 400 KRT?
The 2021 Kawasaki Ninja 400 KRT 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 KRT weigh?
The 2021 Kawasaki Ninja 400 KRT has a Dry weight of 165.0 kg (363.8 pounds).
Shop this bike
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The 2021 Kawasaki Ninja 400 KRT is a powerful and stylish sports bike that delivers an impressive performance on the road. With its 399cc parallel-twin engine, this motorcycle offers a thrilling riding experience with smooth power delivery and quick acceleration. The KRT edition features the iconic Kawasaki Racing Team colors, giving it a striking and aggressive look that is sure to turn heads. Plus, with its lightweight chassis and responsive handling, the Ninja 400 KRT is a joy to ride, whether you're navigating city streets or hitting the open road.
In addition to its impressive performance, the 2021 Kawasaki Ninja 400 KRT also offers a comfortable and ergonomic riding position, making it suitable for long rides. The bike's advanced braking system and ABS provide excellent stopping power and safety, while its high-quality components and build ensure durability and reliability. Overall, the Ninja 400 KRT is a fantastic choice for riders looking for a combination of style, performance, and comfort in a sporty motorcycle.
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