Built around Sym's scooter motorcycle platform, the 2011 Sym HD2 relies on a 124.5 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 12.9 HP (9.4 kW) at 8,500 rpm while maximum torque reaches 10.9 Nm (8 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a automatic gearbox. With a specific output of 103.6 HP per liter and a 2,000 rpm working window between peak torque (6,500 rpm) and peak power (8,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the HD2 measures 125 kg (276 lbs) dry, translating to a power-to-weight ratio of 0.1 HP/kg (9.69 kg per horsepower). Rider ergonomics and chassis geometry center around a 720 mm (28.3 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,380 mm (54.3 in) wheelbase engineered for quick, flickable steering geometry. The 8-liter (2.1 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
103.6 HP/L
Power-to-Weight
0.1 HP/kg (9.69 kg/HP)
Power Band Window
6,500–8,500 rpm
Standover Height
720 mm (28.3 in)
Engine
Displacement124.5 ccm (7.60 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power12.9 HP (9.4 kW)) @ 8500 RPM
Torque10.9 Nm (1.1 kgf-m or 8.0 ft.lbs) @ 6500 RPM
Compression10.5:1
Valves/Cylinder4
Fuel SystemCarburettor
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionCDI
CoolingLiquid
Transmission
GearboxAutomatic
Chassis
Front SuspensionTelehydraulic
Rear SuspensionMonoshock
Wheelbase1380 mm (54.3 inches)
Wheels & Brakes
Front Tyre100/80-16
Rear Tyre120/80-16
Front BrakesSingle disc
Front Brake Ø220 mm (8.7 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
WheelsAluminium rims
Dimensions & Weight
Dry Weight125.0 kg (275.6 pounds)
Power/Weight0.1030 HP/kg
Seat Height720 mm (28.3 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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
