At the heart of the 2021 Ksr GRS 125 sport motorcycle, Ksr pairs a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 10.7 HP (7.8 kW) at 9,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain 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 GRS 125 measures 150 kg (331 lbs) dry, translating to a power-to-weight ratio of 0.07 HP/kg (14.02 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,300 mm (51.2 in) wheelbase engineered for quick, flickable steering geometry. The 7.5-liter (2 US gal) fuel tank paired with a rated consumption of 2.3 L/100 km provides an estimated theoretical range of roughly 326 km (203 miles) between fill-ups.
Within MotoLibrary's Ksr archive, this model family spans 3 indexed model years from 2016 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
85.6 HP/L
Power-to-Weight
0.07 HP/kg (14.02 kg/HP)
Theoretical Range
~326 km (203 mi)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power10.7 HP (7.8 kW)) @ 9000 RPM
Fuel SystemCarburettor
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
DrivelineSEmi-automatic
Performance
Fuel Consumption2.30 litres/100 km (43.5 km/l or 102.27 mpg)
Greenhouse Gases53.4 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.
