| MODEL | VESPA 125 1951 - 1952 |
| Year | 1951 - 1952 |
| Engine Type | Two stroke, single cylinder |
| Displacement / Capacity | 124.8 cc / 7.6 cu in |
| Bore X Stroke | 56.5 x 49.8 mm |
| Compression Ratio | 6.3:1 |
| Cooling System | Air cooled |
| Max Power | 2.9 kW / 4 hp @ 4500 rpm |
| Max Torque | — |
| Ignition | Contact breaker and coil |
| Induction | Deflector piston |
| Start System | Kick start |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 3 speed, grip shift, constant mesh (1st 12 / 2nd 7.5 / 3rd 4.78:1) |
| Clutch | Oil bath, 2 cork plate |
| Final Drive | Direct drive |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Elastic with coil spring and hydraulic shock absorber |
| Rear Suspension | Elastic with coil spring and hydraulic shock absorber |
| Front Brakes | 125 mm drum |
| Rear Brakes | 125 mm drum |
| DIMENSION SPECS | |
| Overall Length | 1655 mm / 65.2 in |
| Overall Width | 790 mm / 31.1 in |
| Overall Height | — |
| Seat Height | 790 mm / 31.1 in |
| Wheelbase | 1130 mm / 44.5 in |
| Ground Clearance | — |
| Dry Weight | 85 kg / 187 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.5 x 8 in |
| Rear Tyre | 3.5 x 8 in |
| FUEL SYSTEM | |
| Fuel Capacity | 5 Litres / 1.3 US gal |
| Fuel Consumption | 2 L/100 km / 50 km/l / 118 US mpg |
| Top Speed | 70 km/h / 43.5 mph |
The 1951 refresh replaced the exposed gear linkage with control cables and added hydraulic dampers front and rear, plus a longer footboard for a passenger and a larger rear brake. A rectangular tail lamp, a redesigned saddle hiding the suspension, and a fuel tap with reserve were also new. It became famous through the film Roman Holiday.
