Engineered by Keeway for the sport motorcycle segment, the 2019 Keeway RKS 125 Sport E4 relies on a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 11.3 HP (8.2 kW) at 8,750 rpm while maximum torque reaches 9.5 Nm (7 lb-ft) at 7,250 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 90.4 HP per liter and a 1,500 rpm working window between peak torque (7,250 rpm) and peak power (8,750 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 RKS 125 Sport E4 measures 136 kg (300 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (12.04 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, combined with a 1,350 mm (53.1 in) wheelbase engineered for quick, flickable steering geometry. The 16-liter (4.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Keeway archive, this model family spans 2 indexed model years from 2019 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
90.4 HP/L
Power-to-Weight
0.08 HP/kg (12.04 kg/HP)
Power Band Window
7,250–8,750 rpm
Standover Height
760 mm (29.9 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power11.3 HP (8.2 kW)) @ 8750 RPM
Torque9.5 Nm (1.0 kgf-m or 7.0 ft.lbs) @ 7250 RPM
Bore x Stroke57.0 x 48.8 mm (2.2 x 1.9 inches)
Valves/Cylinder2
Fuel SystemCarburettor. EFI
Fuel ControlSingle Overhead Cams (SOHC)
LubricationPressure splash
CoolingAir
Transmission
Final DriveChain (final drive)
ClutchWet, multiple-plate
Chassis
Frame TypeArch bar
Front SuspensionTelescopic fork
Front Travel110 mm (4.3 inches)
Rear SuspensionTelescopic coil spring oil damped
Wheelbase1350 mm (53.1 inches)
Ground Clearance185 mm (7.3 inches)
Wheels & Brakes
Front Tyre90/90-17
Rear Tyre120/80-17
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight136.0 kg (299.8 pounds)
Power/Weight0.0828 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.
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.
