Engineered by Honda for the sport motorcycle segment, the 2021 Honda MSX125 Grom relies on a 124.9 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 9.7 HP (7.1 kW) at 7,250 rpm while maximum torque reaches 10.5 Nm (7.7 lb-ft) at 5,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 77.7 HP per liter and a 1,750 rpm working window between peak torque (5,500 rpm) and peak power (7,250 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 MSX125 Grom measures 103 kg (227 lbs) wet (curb), translating to a power-to-weight ratio of 0.09 HP/kg (10.62 kg per horsepower). Rider ergonomics and chassis geometry center around a 761 mm (30 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,200 mm (47.2 in) wheelbase engineered for quick, flickable steering geometry. The 6-liter (1.6 US gal) fuel tank paired with a rated consumption of 1.76 L/100 km provides an estimated theoretical range of roughly 341 km (212 miles) between fill-ups.
Specific Output
77.7 HP/L
Power-to-Weight
0.09 HP/kg (10.62 kg/HP)
Power Band Window
5,500–7,250 rpm
Theoretical Range
~341 km (212 mi)
Engine
Displacement124.9 ccm (7.62 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power9.7 HP (7.1 kW)) @ 7250 RPM
Torque10.5 Nm (1.1 kgf-m or 7.7 ft.lbs) @ 5500 RPM
Compression10.0:1
Bore x Stroke52.4 x 57.9 mm (2.1 x 2.3 inches)
Valves/Cylinder2
Fuel SystemInjection. PGM-FI with automatic enrichment
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionElectronic
CoolingAir
Transmission
Gearbox4-speed
Final DriveChain (final drive)
ClutchMultiplate wet
Performance
Fuel Consumption1.76 litres/100 km (56.8 km/l or 133.65 mpg)
Greenhouse Gases40.8 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.
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.
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.
