Positioned in Kawasaki's sport motorcycle lineup, the 2021 Kawasaki Ninja 125 relies on a 125 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 15 HP (10.9 kW) at 10,000 rpm while maximum torque reaches 11.7 Nm (8.6 lb-ft) at 7,700 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 120 HP per liter and a 2,300 rpm working window between peak torque (7,700 rpm) and peak power (10,000 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the Ninja 125 measures 148 kg (326 lbs) wet (curb), translating to a power-to-weight ratio of 0.1 HP/kg (9.87 kg per horsepower). 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 1,330 mm (52.4 in) wheelbase engineered for quick, flickable steering geometry. The 7.4-liter (2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 6 indexed model years from 2019 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
120 HP/L
Power-to-Weight
0.1 HP/kg (9.87 kg/HP)
Power Band Window
7,700–10,000 rpm
Standover Height
785 mm (30.9 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power15.0 HP (10.9 kW)) @ 10000 RPM
Torque11.7 Nm (1.2 kgf-m or 8.6 ft.lbs) @ 7700 RPM
Compression11.7:1
Bore x Stroke58.0 x 47.2 mm (2.3 x 1.9 inches)
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionDigital
CoolingLiquid
Transmission
Final DriveChain (final drive)
Chassis
Trail90 mm (3.5 inches)
Front SuspensionInverted fork
Rear SuspensionOffset laydown single-shock with adjustable preload
Wheelbase1330 mm (52.4 inches)
Ground Clearance170 mm (6.7 inches)
Wheels & Brakes
Front Tyre100/80-17
Rear Tyre130/70-17
Front BrakesDouble disc
Front Brake Ø200 mm (7.9 inches)
Rear BrakesSingle disc
Rear Brake Ø185 mm (7.3 inches)
Dimensions & Weight
Weight incl.148.0 kg (326.3 pounds)
Seat Height785 mm (30.9 inches) If adjustable, lowest setting.
Overall Height1075 mm (42.3 inches)
Overall Length1935 mm (76.2 inches)
Overall Width685 mm (27.0 inches)
Fuel Capacity7.40 litres (1.96 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.
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.
