Built around Kawasaki's sport motorcycle platform, the 2021 Kawasaki Ninja 400 relies on a 399 cc (24.4 cu in) liquid-cooled twin, four-stroke powerplant. Internal engine geometry specifies a bore and stroke of 70.0 x 51.8 mm (2.8 x 2.0 inches) with a 11.5:1 compression ratio.
On the scales, the Ninja 400 measures 167 kg (368 lbs) dry. Rider ergonomics and chassis geometry center around a 785 mm (30.9 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,369 mm (53.9 in) wheelbase engineered for quick, flickable steering geometry. The 3.7-liter (1 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 8 indexed model years from 2014 to 2023, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
785 mm (30.9 in)
Engine
Displacement399.0 ccm (24.35 cubic inches)
Engine TypeTwin, four-stroke
Compression11.5:1
Bore x Stroke70.0 x 51.8 mm (2.8 x 2.0 inches)
Fuel SystemInjection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCBI w/digital advance
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchAssist and Slipper Clutch
Chassis
Frame TypeTrellis, high-tensile steel
Rake24.7°
Trail91 mm (3.6 inches)
Front Suspension41mm hydraulic telescopic fork
Front Travel119 mm (4.7 inches)
Rear SuspensionHorizontal back-link with adjustable spring preload
Rear Travel130 mm (5.1 inches)
Wheelbase1369 mm (53.9 inches)
Ground Clearance140 mm (5.5 inches)
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre150/70-17
Front BrakesSingle disc. Single petal-type disc with 2-piston calipers. Optional ABS.
Front Brake Ø310 mm (12.2 inches)
Rear BrakesSingle disc. Single petal-type disc with single-piston caliper. Optional ABS.
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight167.0 kg (368.2 pounds)
Seat Height785 mm (30.9 inches) If adjustable, lowest setting.
Overall Height1120 mm (44.1 inches)
Overall Length1989 mm (78.3 inches)
Overall Width711 mm (28.0 inches)
Fuel Capacity3.70 litres (0.98 US gallons)
Other
StarterElectric
Color OptionsPearl Blizzard White, Metallic Spark Black/ Metallic
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
