2004 Sym HD 125 Technical Analysis & Specification Breakdown
Positioned in Sym's scooter motorcycle lineup, the 2004 Sym HD 125 features a 125 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 11.4 HP (8.3 kW). With a specific output of 91.2 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 HD 125 measures 125 kg (276 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (10.96 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,385 mm (54.5 in) wheelbase engineered for quick, flickable steering geometry. The 8.3-liter (2.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 108 km/h (67 mph).
Within MotoLibrary's Sym archive, this model family spans 3 indexed model years from 2004 to 2007, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
91.2 HP/L
Power-to-Weight
0.09 HP/kg (10.96 kg/HP)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power11.4 HP (8.3 kW))
Compression10.5:1
Bore x Stroke57.0 x 48.8 mm (2.2 x 1.9 inches)
Valves/Cylinder4
CoolingLiquid
Performance
Top Speed108.0 km/h (67.1 mph)
Chassis
Frame TypePipe under bone
Wheelbase1385 mm (54.5 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 Ø130 mm (5.1 inches)
Dimensions & Weight
Dry Weight125.0 kg (275.6 pounds)
Power/Weight0.0912 HP/kg
Alt. Seat Height807 mm (31.8 inches) If adjustable, highest 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.
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.
