Engineered by WSK for the classic motorcycle segment, the 1983 WSK 125 M06B3, engine model S01 Z3A Lux pairs a 125 cc (7.6 cu in) air-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 8 HP (5.8 kW) at 5,300 rpm while maximum torque reaches 9.8 Nm (7.2 lb-ft) at 4,200 rpm, transferring power to the rear wheel through a 3-speed gearbox and chain final drive. With a specific output of 64 HP per liter and a 1,100 rpm working window between peak torque (4,200 rpm) and peak power (5,300 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the 125 M06B3, engine model S01 Z3A Lux measures 114 kg (251 lbs) wet (curb), translating to a power-to-weight ratio of 0.07 HP/kg (14.25 kg per horsepower). Rider ergonomics and chassis geometry center around a 766 mm (30.2 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,281 mm (50.4 in) wheelbase engineered for quick, flickable steering geometry. The 12.5-liter (3.3 US gal) fuel tank paired with a rated consumption of 2.8 L/100 km provides an estimated theoretical range of roughly 446 km (277 miles) between fill-ups, while factory top speed is listed at 85 km/h (53 mph).
Specific Output
64 HP/L
Power-to-Weight
0.07 HP/kg (14.25 kg/HP)
Power Band Window
4,200–5,300 rpm
Theoretical Range
~446 km (277 mi)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power8.0 HP (5.8 kW)) @ 5300 RPM
Torque9.8 Nm (1.0 kgf-m or 7.2 ft.lbs) @ 4200 RPM
Compression7.8:1
Bore x Stroke52.0 x 58.0 mm (2.0 x 2.3 inches)
Fuel SystemCarburettor. G20 M2A 20 mm
Fuel ControlPort control
IgnitionMagneto - no baterry required, self powered
LubricationOil and petrol mixture 1:30, spark plug Bosch ´225
CoolingAir
Max RPM5400
Transmission
Gearbox3-speed
Final DriveChain (final drive)
ClutchWet three plate
Performance
Top Speed85.0 km/h (52.8 mph)
Fuel Consumption2.80 litres/100 km (35.7 km/l or 84.01 mpg)
Greenhouse Gases65.0 CO2 g/km. (CO2 - Carbon dioxide emission)
ExhaustSingle stainless steel pipe, or economy painted exhoust end pipe
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.
