Built around WK's super motard motorcycle platform, the 2017 WK ZS 125 relies on a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 12.3 HP (9 kW) at 9,500 rpm while maximum torque reaches 11 Nm (8.1 lb-ft) at 8,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 99.2 HP per liter and a 1,500 rpm working window between peak torque (8,000 rpm) and peak power (9,500 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 ZS 125 measures 160 kg (353 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (13.01 kg per horsepower). Rider ergonomics and chassis geometry center around a 82 mm (3.2 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops. The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
99.2 HP/L
Power-to-Weight
0.08 HP/kg (13.01 kg/HP)
Power Band Window
8,000–9,500 rpm
Standover Height
82 mm (3.2 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power12.3 HP (9.0 kW)) @ 9500 RPM
Torque11.0 Nm (1.1 kgf-m or 8.1 ft.lbs) @ 8000 RPM
Compression10.0:1
Bore x Stroke56.5 x 49.5 mm (2.2 x 1.9 inches)
Fuel SystemCarburettor
Fuel ControlSingle Overhead Cams (SOHC)
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionUpside down telescopic
Rear SuspensionSingle shock, air, adjustable.
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre140/70-17
Front BrakesDouble disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight160.0 kg (352.7 pounds)
Power/Weight0.0771 HP/kg
Seat Height82 mm (3.2 inches) If adjustable, lowest setting.
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.
