Positioned in Vespa's scooter motorcycle lineup, the 2005 Vespa ET4 125 relies on a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 16.1 HP (11.7 kW) at 8,800 rpm, transferring power to the rear wheel through a automatic gearbox. With a specific output of 129.8 HP per liter, 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 ET4 125 measures 104 kg (229 lbs) dry, translating to a power-to-weight ratio of 0.15 HP/kg (6.46 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,280 mm (50.4 in) wheelbase engineered for quick, flickable steering geometry. The 9-liter (2.4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 95 km/h (59 mph).
Specific Output
129.8 HP/L
Power-to-Weight
0.15 HP/kg (6.46 kg/HP)
Standover Height
780 mm (30.7 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power16.1 HP (11.7 kW)) @ 8800 RPM
Bore x Stroke57.0 x 48.6 mm (2.2 x 1.9 inches)
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionElectronic CDI and variable timing
LubricationWet pump with cup capacity of 1 litre, chain driven lobe pump
CoolingAir
Transmission
GearboxAutomatic
ClutchAutomatic centrifuge type
Performance
Top Speed95.0 km/h (59.0 mph)
Chassis
Frame TypePressed steel monocoque
Front SuspensionOscillating arm with helicoidal spring and hydraulic double effect single damper
Rear SuspensionHelicoidal adjustable spring and hydraulic double effect single damper
Wheelbase1280 mm (50.4 inches)
Wheels & Brakes
Front Tyre100/80-10
Rear Tyre120/70-10
Front BrakesDouble disc
Front Brake Ø200 mm (7.9 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø110 mm (4.3 inches)
Dimensions & Weight
Dry Weight104.0 kg (229.3 pounds)
Power/Weight0.1547 HP/kg
Seat Height780 mm (30.7 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
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Seat Height
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Weight
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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.
