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Kawasaki 2021 Ninja 400 Sports Motorcycle Review Specs Price

The Kawasaki 2021 Ninja 400 Sports Motorcycle is a lightweight sport bike with a built-in, track-inspired design. Unlike other light sports bike rivals, the Ninja 400 has more power thanks to its larger displacement engine. Fresh, angular bodywork, including LED headlights for the latest styling; And Kawasaki Racing Team DNA, the only manufacturer to have won five consecutive FIM Superbike World Championships. Every ride is so exciting that only a ninja sport bike can do it.

Kawasaki 2021 Ninja 400 Sports Motorcycle

With a 399cc displacement and the sophistication of the twin-cylinder engine, the Ninja® 400 is the most powerful in its class. Accessible power, excellent ergonomics, and class-leading performance provide a smooth, manageable ride that will appeal to both beginner and experienced riders, setting a new standard for everyday epic sport riding.

Kawasaki 2021 Ninja 400 Sports Motorcycle – Features and Specs

The engine is strong, but the answer is smooth and predictable. Easy to use assist and sleeper clutch with a light pull and wide engagement range. The slim seat design helps improve ground access. Trails frame provides light, contributes to predictable handling and significant weight savings. Most oversized front brakes for class on class.

Parallel Twin Engine

Both new and experienced riders will love the engine rider’s friendly demeanor, smooth response, and much less torque.

The downdraft intake track takes intake air into the cylinder in a short, straightway, increasing cylinder filling efficiency and contributing to power, especially at high RPM. The down draft also frees up space behind the intake set, allowing it to be built with less ground access.

Larger airboxes help with intake performance, which in turn increases power. During acceleration, the airbox design lets the rider hear the engine’s intake notes more clearly. The unequal height of the intake funnels helps to smooth the throttle response by filtering the torque dips.

At all engine speeds, 7mm intake and 23.5mm exhaust valves increase efficiency. Fake camshafts, usually only available on large displacement machines, help save weight.

The bike has oil jets that cool the underside of the piston, giving the piston a lighter design. The open deck design of the aluminum die-cast cylinder allows good heat dissipation and reduces engine weight—the sleeveless cylinder in which the mounted bore is used. To help reduce the total engine height, the cylinder is moved 20 degrees.


The Assist and Sleeper Clutch (KP) is small, and its working plates help reduce the lever draw, making the lever feel very light. It’s easy to control with a wide range of engagements.

The clutch is pressed together during acceleration (Assist function) using the rotating forces of the clutch hub and pressure plate, allowing the use of low and light clutch springs for a soft feeling on the lever. The sleeper function allows some clutches to slip during high back-torque conditions, such as when the low gear is selected while shifting down, rear wheel hops and reduced stops due to engine lock-up. It helps Close the gear ratio and helps in smooth shifting.

Kawasaki 2021 Ninja 400 Sports Motorcycle

Lightweight Trellis Frame

The design of the trailer frame is comparable to that of the Ninja H2TM. The structure was designed using Kawasaki’s state-of-the-art dynamic stiffness analysis to achieve maximum stiffness with minimal weight, which significantly increases the overall low curb mass of the bike happens.

The supersport-style chassis combines a short wheelbase and extended swing arm with a sharp steering angle, creating light, quick handling.


The square tube swing arm provides stiffness without excessive gusting, resulting in weight savings. Ride quality is better than the suspension linkage ratios and shock settings behind the Uni-Trak® (KP). The 41mm fork provides rigidity and smooth suspension movement, resulting in more front-wheel engagement.


The stylish Star Pattern 5-spoke wheel, comparable to the Ninja® 650, produces weight loss while improving handling by increasing cornering performance. Radial tires are lighter, have more traction, and contribute to both agile handling and comfort during the ride.


The Ninja 400’s extensive bodywork makes it look bigger than an entry-level bike, which is compatible with the Ninja ZXTM-6R / 10R. Kawasaki’s supersport flagship Ninja H2TM and Ninja ZX-10R have been born by Sharp Cowl on the front with chin spoilers. Thin LED headlights make the car look more aggressive, make it more noticeable to other drivers, and provide more light than standard bulbs.

The Ninja 400’s tail cowl has a triple-pack design similar to the Ninja H2, which adds to the Ninja 400’s bloodline. The beautiful shape of the Ninja 400 is complemented by an LED taillight that resembles the Ninja ZX-10R.

Kawasaki 2021 Ninja 400 Sports Motorcycle – Price

The new Kawasaki 2021 Ninja 400 is available for $4,999 only.

Kawasaki 2021 Ninja 400 Sports Motorcycle

Kawasaki 2021 Ninja 400 Sports Motorcycle – Technical Specifications


Type 4-Stroke, DOHC, Liquid-Cooled, 4 Valve Cylinder Head, Parallel-Twin
Displacement 399 cc
Bore & Stroke 70mm x 51.8mm
Maximum Torque 28.0 lb-ft at 8,000 rpm
Compression Ratio 11.5:1
Fuel System DFI featuring 32mm Throttle Bodies (2)
Ignition TCBI contains Digital Advance
Transmission 6-Speed including Positive Neutral Finder
Final Drive Sealed Chain


Rake/Trail 24.7-degree / 3.6 inches
Front Wheel Travel 4.7 in.
Rear Wheel Travel 5.1 in.
Front Tire Size 110/70-17
Rear Tire Size 150/60-17
Wheelbase 53.9 in.
Front Suspension 41mm Hydraulic Telescopic Fork
Rear Suspension Bottom Link Uni-Trak® with Adjustable Preload
Front Brake Type Single 310mm Petal Disc with 2-Piston Balanced Actuation Caliper
Rear Brake Type Single 220mm Petal Disc with 2-Piston Caliper
Fuel Tank Capacity 3.7 gal.
Seat Height 30.9 in.
Curb Weight 362 / 366 (ABS) lb.

Kawasaki 2021 Ninja 400 Sports Motorcycle


Warranty 12 months
Kawasaki Protection Plus™ 12, 24, 36, or 48 months

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