Built around Kawasaki's sport motorcycle platform, the 2025 Kawasaki Ninja ZX-4RR utilizes a 399 cc (24.4 cu in) liquid-cooled in-line four, four-stroke layout. In factory specification, peak output is rated at 76.4 HP (55.8 kW) at 14,500 rpm while maximum torque reaches 39 Nm (28.8 lb-ft) at 1,300 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 191.5 HP per liter and a 13,200 rpm working window between peak torque (1,300 rpm) and peak power (14,500 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the Ninja ZX-4RR measures 189 kg (417 lbs) wet (curb), translating to a power-to-weight ratio of 0.4 HP/kg (2.47 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 1,380 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
191.5 HP/L
Power-to-Weight
0.4 HP/kg (2.47 kg/HP)
Power Band Window
1,300–14,500 rpm
Standover Height
800 mm (31.5 in)
Engine
Displacement399.0 ccm (24.35 cubic inches)
Engine TypeIn-line four, four-stroke
Power76.4 HP (55.8 kW)) @ 14500 RPM
Torque39.0 Nm (4.0 kgf-m or 28.8 ft.lbs) @ 1300 RPM
Compression12.3:1
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 ControlOverhead Cams (OHC)
IgnitionDigital
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet multi-disc
Chassis
Frame TypeTrellis, high-tensile steel
Rake23.5°
Trail97 mm (3.8 inches)
Front Suspension37mm inverted fork with SFF-BP internals and spring preload adjustability
Front Travel120 mm (4.7 inches)
Rear SuspensionHorizontal Back-link, BFRC lite gas charged shock w/ piggyback reservoir, adjustable compression, rebound and spring preload
Rear Travel124 mm (4.9 inches)
Wheelbase1380 mm (54.3 inches)
Ground Clearance135 mm (5.3 inches)
Wheels & Brakes
Front Tyre120/70-17
Rear Tyre160/60-17
Front BrakesDouble disc. ABS.
Front Brake Ø290 mm (11.4 inches)
Rear BrakesSingle disc. ABS.
Rear Brake Ø220 mm (8.7 inches)
WheelsCast alloy, 5-spoke
Dimensions & Weight
Dry Weight166.0 kg (366.0 pounds)
Weight incl.189.0 kg (416.7 pounds)
Power/Weight0.4605 HP/kg
Seat Height800 mm (31.5 inches) If adjustable, lowest setting.
Overall Height1110 mm (43.7 inches)
Overall Length1990 mm (78.3 inches)
Overall Width765 mm (30.1 inches)
Fuel Capacity15.14 litres (4.00 US gallons)
Other
StarterElectric
Color OptionsLime Green/Ebony/Pearl Blizzard White
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.
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.
