Vespa 125




Make Model

Vespa 125


1951 - 52


144 724 units


Two stroke, single cylinder


124.8 cc 7.6 cub in
Bore x Stroke 56.5 x 49.8 mm
Carburetor Dellorto TA 17B .
Compression Ratio 6.3:1
Cooling Air cooled

Fuel Mixture



Deflector piston


Contact breaker & coil
Battery 6V AC
Starting Kick start
Clutch Oil bath, 2 cork plate

Max Power

2.9  kW / 4 hp @ 4500 rpm


3 Speed, grip-shift, constant mesh
Gears 1st 12 / 2nd 7.5 / 3rd 4.78:1
Final Drive Direct drive

Front Suspension

Elastic with coil spring and hydraulic shock absorber

Rear Suspension

Elastic with coil spring and hydraulic shock absorber

Front Brakes

Drum, 125 mm

Rear Brakes

Drum, 125 mm
Wheels Interchangeable

Front Tyre

3.5 x 8"

Rear Tyre

3.5 x 8"


Length:  1655 mm / 65.2 in

Width:     790 mm / 31.1 in

Wheelbase 1130 mm / 44.5 in
Seat Height 790 mm / 31.1 in

Dry Weight

85 kg / 187 lbs

Fuel Capacity 

5 L / 1.3 US gal

Consumption  average

2 L/100 km / 50 km/L / 118 US mpg

Top Speed

70 km/h / 43.5 mph


Dark Metallic Green, Silver/Green


Vespa by Giorgio Sarti,,, Hemmings Motor News

During 1951, many improvements were made on Vespa's. Old type of push-rod linkage (Bowden) was replaced by a new type of soft control cables for the shifter. Rear suspension was now fitted with an hydraulic shock absorber. The old style front coil spring type shock absorber was now supported by a new hydraulic absorber. The footboard is now longer for passenger and more comfort.

It was easily distinguished by the exposed gear cables and the running boards. IIt was fitted with a Dellorto carburetor TA 17B . The rear brake was enhanced by increasing the width and diameter. The front wheel had a aluminium hubcap. 

Another difference was the gear change, with soft control cables replacing the earlier push-rod linkage. The fuel-oil mixture tap with its filter and key to open and lock the fuel reserve was particularly useful. From an aesthetical point of view, the rear lamp, round in the earlier models, was now rectangular; the saddle had a new colour and design – it was closed in front to hide the suspension movement. Very popular in those years, the 1951 model was the Vespa on which Audrey Hepburn and Cary Grant made their romantic escapade in the unforgettable film Roman Holiday.