Positioned in Ksr's scooter motorcycle lineup, the 2021 Ksr Sirion 125 utilizes a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 9.1 HP (6.7 kW) at 7,500 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 72.8 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 Sirion 125 measures 115 kg (254 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (12.64 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,280 mm (50.4 in) wheelbase engineered for quick, flickable steering geometry. The 6-liter (1.6 US gal) fuel tank paired with a rated consumption of 3 L/100 km provides an estimated theoretical range of roughly 200 km (124 miles) between fill-ups.
Within MotoLibrary's Ksr archive, this model family spans 3 indexed model years from 2017 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
72.8 HP/L
Power-to-Weight
0.08 HP/kg (12.64 kg/HP)
Theoretical Range
~200 km (124 mi)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power9.1 HP (6.7 kW)) @ 7500 RPM
Fuel SystemCarburettor
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
DrivelineCVT
Performance
Fuel Consumption3.00 litres/100 km (33.3 km/l or 78.41 mpg)
Greenhouse Gases69.6 CO2 g/km. (CO2 - Carbon dioxide emission)
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.
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.
