Engineered by Kawasaki for the naked motorcycle segment, the 2021 Kawasaki Z125 relies on a 125 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 14.8 HP (10.8 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 118.4 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 Z125 measures 146 kg (322 lbs) wet (curb), translating to a power-to-weight ratio of 0.1 HP/kg (9.86 kg per horsepower). Rider ergonomics and chassis geometry center around a 815 mm (32.1 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 11-liter (2.9 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 7 indexed model years from 2017 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
118.4 HP/L
Power-to-Weight
0.1 HP/kg (9.86 kg/HP)
Power Band Window
7,700–10,000 rpm
Standover Height
815 mm (32.1 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power14.8 HP (10.8 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. DFI® with 24mm throttle bodies
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCBI w/electronic advance
CoolingLiquid
Transmission
Final DriveChain (final drive)
ClutchWet multi-disc
DrivelineSealed chain
Chassis
Frame TypeTubular diamond, steel
Trail90 mm (3.5 inches)
Front SuspensionTelescopic fork
Front Travel110 mm (4.3 inches)
Rear SuspensionSwingarm, single shock
Rear Travel120 mm (4.7 inches)
Wheelbase1330 mm (52.4 inches)
Ground Clearance185 mm (7.3 inches)
Wheels & Brakes
Front Tyre100/80-17
Rear Tyre130/70-17
Front BrakesSingle disc. Petal style disc
Front Brake Ø290 mm (11.4 inches)
Rear BrakesSingle disc. Petal style disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Weight incl.146.0 kg (321.9 pounds)
Seat Height815 mm (32.1 inches) If adjustable, lowest setting.
Overall Height1015 mm (40.0 inches)
Overall Length1935 mm (76.2 inches)
Overall Width740 mm (29.1 inches)
Fuel Capacity11.00 litres (2.91 US gallons)
Other
StarterElectric
Color OptionsMetallic Flat Spark/Black, Pearl Flat/Stardust White, Candy Lime Green/Metallic Spark Black/, Metallic Flat Spark/ Black Metallic Black/Metallic Spark Black
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.
