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MotoLibrary Score
36/100Commuter
Power/Weight
0.08 hp/kg
Top Speed
90 km/h
Engine
125 ccm
Technical Overview
2020 Junak 125 S Technical Analysis & Specification Breakdown
Engineered by Junak for the naked motorcycle segment, the 2020 Junak 125 S utilizes a 125 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 10.7 HP (7.8 kW) at 8,500 rpm, transferring power to the rear wheel through shaft drive (cardan) final drive. With a specific output of 85.6 HP per liter, 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 S measures 130 kg (287 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (12.15 kg per horsepower). Rider ergonomics and chassis geometry center around a 775 mm (30.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance. The 18-liter (4.8 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 90 km/h (56 mph).
Specific Output
85.6 HP/L
Power-to-Weight
0.08 HP/kg (12.15 kg/HP)
Standover Height
775 mm (30.5 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power10.7 HP (7.8 kW)) @ 8500 RPM
Fuel SystemInjection
Fuel ControlOverhead Cams (OHC)
CoolingLiquid
Transmission
Final DriveShaft drive (cardan) (final drive)
Performance
Top Speed90.0 km/h (55.9 mph)
Wheels & Brakes
Front Tyre80/90-17
Rear Tyre130/70-17
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight130.0 kg (286.6 pounds)
Power/Weight0.0825 HP/kg
Seat Height775 mm (30.5 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.
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.
