2020 Ninja 400

The largest displacement engine in its class offers 399cc of broad, responsive power that’s easy to manage and exciting to push. Excellent roll-on acceleration facilitates merging in traffic, while the Assist and Slipper Clutch reduces rear-wheel hop and ensures a light clutch pull and seamless shifting.





Based on feedback from racing activities, the Assist & Slipper Clutch uses two types of cams (an assist cam and a slipper cam) to either drive the clutch hub and operating plate together or apart.

Under normal operation, the assist cam functions as a self-servo mechanism, pulling the clutch hub and operating plate together to compress the clutch plates. This allows the total clutch spring load to be reduced, resulting in a lighter clutch lever feel when operating the clutch.

When excessive engine braking occurs – as a result of quick downshifts (or an accidental downshift) – the slipper cam comes into play, forcing the clutch hub and operating plate apart. This relieves pressure on the clutch plates to reduce back-torque and helps prevent the rear tire from hopping and skidding. This race-style function is particularly useful when sport or track riding.


Using high-precision electronic control for engine management, Kawasaki models can achieve a high level of fuel efficiency. However, fuel consumption is greatly affected by throttle use, gear selection, and other elements under the rider’s control. The Economical Riding Indicator is a function that indicates when current riding conditions are consuming a low amount of fuel. The system continuously monitors fuel consumption, regardless of vehicle speed, engine speed, throttle position and other riding conditions. When fuel consumption is low for a given speed (i.e. fuel efficiency is high), an “ECO” mark appears on the instrument panel’s LCD screen. By riding so that the “ECO” mark remains on, fuel consumption can be reduced.

While effective vehicle speed and engine speed may vary by model, paying attention to conditions that cause the “ECO” mark to appear can help riders improve their fuel efficiency – a handy way to increase cruising range. Further, keeping fuel consumption low also helps minimize negative impact on the environment.



Kawasaki ABS systems use front and rear wheel sensors to constantly monitor wheel speed. Should information from either of the sensors indicate that wheel lock has occurred, the ABS ECU directs the pump in the ABS unit to modulate brake fluid pressure (releasing and reapplying pressure so that traction can be regained) until normal operation resumes. ABS offers rider reassurance that contributes to greater riding enjoyment.


Proper fit is key for rider comfort and control. However, the ideal fit varies from rider to rider, depending on their physical dimensions and riding style.

ERGO-FIT® is an interface system designed to allow riders to find their ideal riding position. Various points of the chassis interface (the handlebar, footpegs and seat, etc.) can be adjusted through a combination of interchangeable parts and parts with adjustable positions. This enables a wide range of riders to find a riding position that offers both comfort and control. Feeling at one with their machine, they will be able to experience how Kawasaki machines are fun and rewarding to ride.

*Adjustable parts and their range of adjustability vary by model.

Additional information

Weight168 kg
Dimensions1990 × 710 × 1120 mm

Liquid cooling, 4-stroke, twin cylinder parallel


399 cc

Bore x stroke

70 x 51,8 mm

Compression ratio

11.5 : 1

Valve system

DOHC, 8 valves


DFI® with dual 32mm throttle bodies


TCBI with digital advance

Sistema de arranque



Forced lubrication, wet sump

Brake, front

1 lobed disc, 2-piston floating caliper, ABS, Ø 310 mm disc

Brake, rear

1 lobed disc, 1 piston, 220mm disc, ABS

Front wheel suspension

104 mm travel, 41mm hydraulic telescopic fork

Rear wheel suspension

130mm travel, Horizontal back-link with adjustable spring preload

Rated output

45 Hp (33,4 kW) @ 10.000 rpm

CO2 emissions

100 g/km

Max. torque

38 Nm (3,9 kgf•m) @ 8.000 rpm


6 speeds

Final drive

Sealed chain

Primary Ratio

2.219 (71/32)

Relation 1

2.929 (41/14)

Relation 2

2.056 (37/18)

Relation 3

1.619 (34/21)

Relation 4

1.333 (32/24)

Relation 5

1.154 (30/26)

Relation 6

1.037 (28/27)

Final Ratio

2.929 (41/14)


wet multi-disc, manual


Multitubular in high tension steel


92 mm

Desplazamiento delantera

120 mm

Desplazamiento trasera

130 mm

Tires, front

110/70 – 17

Tires, rear



1.370 mm

Ground clearance

140 mm

Seat height

785 mm

Fuel capacity

14 liters


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