Engineered by Kawasaki for the sport motorcycle segment, the 2025 Kawasaki Ninja 400 ZX-4R features a 399 cc (24.4 cu in) liquid-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 56 HP (40.9 kW) at 11,500 rpm while maximum torque reaches 35.9 Nm (26.5 lb-ft) at 11,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 140.4 HP per liter and a 500 rpm working window between peak torque (11,000 rpm) and peak power (11,500 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the Ninja 400 ZX-4R measures 188 kg (414 lbs) wet (curb), translating to a power-to-weight ratio of 0.3 HP/kg (3.36 kg per horsepower). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,379 mm (54.3 in) wheelbase engineered for quick, flickable steering geometry. The 15.14-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
140.4 HP/L
Power-to-Weight
0.3 HP/kg (3.36 kg/HP)
Power Band Window
11,000–11,500 rpm
Standover Height
800 mm (31.5 in)
Engine
Displacement399.0 ccm (24.35 cubic inches)
Engine TypeTwin, four-stroke
Power56.0 HP (40.9 kW)) @ 11500 RPM
Torque35.9 Nm (3.7 kgf-m or 26.5 ft.lbs) @ 11000 RPM
Compression11.5:1
Bore x Stroke57.0 x 39.1 mm (2.2 x 1.5 inches)
Valves/Cylinder4
Fuel SystemInjection. DFI® with dual 34mm throttle bodies
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCBI w/digital advance
LubricationForced lubrication, wet sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet multi-disc, manual. Assist and Slipper.
DrivelineSealed chain
Chassis
Frame TypeTrellis, high-tensile steel
Rake23.5°
Trail99 mm (3.9 inches)
Front Suspension37mm inverted Showa fork with SFF-BP internals
Front Travel119 mm (4.7 inches)
Rear SuspensionHorizontal back-link, Showa shock w/ adjustable spring preload
Rear Travel112 mm (4.4 inches)
Wheelbase1379 mm (54.3 inches)
Ground Clearance135 mm (5.3 inches)
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre160/60-17
Front BrakesDouble disc. 4-piston calipers. Optional ABS.
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.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
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.
