Positioned in Junak's sport motorcycle lineup, the 2020 Junak RSK 125 relies on a 125 cc (7.6 cu in) single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 10.5 HP (7.6 kW) at 8,500 rpm, transferring power to the rear wheel through shaft drive (cardan) final drive. With a specific output of 84 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 RSK 125 measures 141 kg (311 lbs) dry, translating to a power-to-weight ratio of 0.07 HP/kg (13.43 kg per horsepower). Rider ergonomics and chassis geometry center around a 760 mm (29.9 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops. The 13.5-liter (3.6 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
84 HP/L
Power-to-Weight
0.07 HP/kg (13.43 kg/HP)
Standover Height
760 mm (29.9 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power10.5 HP (7.6 kW)) @ 8500 RPM
Fuel SystemInjection
Fuel ControlOverhead Cams (OHC)
Transmission
Final DriveShaft drive (cardan) (final drive)
Performance
Top Speed90.0 km/h (55.9 mph)
Wheels & Brakes
Front Tyre110/90-17
Rear Tyre130/70-17
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight141.0 kg (310.9 pounds)
Power/Weight0.0742 HP/kg
Seat Height760 mm (29.9 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.
