2021 Kawasaki Z125 Pro Technical Analysis & Specification Breakdown
Positioned in Kawasaki's naked motorcycle lineup, the 2021 Kawasaki Z125 Pro relies on a 125 cc (7.6 cu in) air-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 a 4-speed gearbox and 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 Pro measures 102 kg (225 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.89 kg per horsepower). Rider ergonomics and chassis geometry center around a 805 mm (31.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,176 mm (46.3 in) wheelbase engineered for quick, flickable steering geometry. The 7.57-liter (2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 9 indexed model years from 2016 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
118.4 HP/L
Power-to-Weight
0.15 HP/kg (6.89 kg/HP)
Power Band Window
7,700–10,000 rpm
Standover Height
805 mm (31.7 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)
Valves/Cylinder2
Fuel SystemInjection. DFI® with 24mm throttle bodies
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTCBI w/electronic advance
CoolingAir
Transmission
Gearbox4-speed
Final DriveChain (final drive)
DrivelineSealed chain
Chassis
Frame TypeBackbone
Rake26.0°
Trail69 mm (2.7 inches)
Front SuspensionTelescopic fork
Front Travel99 mm (3.9 inches)
Rear SuspensionSwingarm, single shock
Rear Travel104 mm (4.1 inches)
Wheelbase1176 mm (46.3 inches)
Ground Clearance155 mm (6.1 inches)
Wheels & Brakes
Front Tyre100/90-12
Rear Tyre120/70-12
Front BrakesSingle disc. Petal style disc
Front Brake Ø200 mm (7.9 inches)
Rear BrakesSingle disc. Petal style disc
Rear Brake Ø184 mm (7.2 inches)
WheelsCast aluminium
Dimensions & Weight
Weight incl.102.0 kg (224.8 pounds)
Seat Height805 mm (31.7 inches) If adjustable, lowest setting.
Overall Height1006 mm (39.6 inches)
Overall Length1699 mm (66.9 inches)
Overall Width749 mm (29.5 inches)
Fuel Capacity7.57 litres (2.00 US gallons)
Other
StarterElectric
Color OptionsPearl Nightshade Teal, Metallic Flat 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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
