Vespa 150 Cosa




Make Model

Vespa  150 Cosa and Cosa Elestart


1988 - 98


Two stroke, single cylinder


150 cc / 9.2 cub in
Bore x Stroke 57.8 x 57 mm
Compression 9.2:1
Carburetor Dell'Orto SHBC 20/20L
Cooling Air cooled, centrifugal fan

Fuel Mixture

Ignition Electronic
Starting Kick start
Spark Plug NGK BR7HS
Battery 12V AC
Clutch Wet, multiplate

Max Power

6.25  kW / 8.5 hp @ 5700 rpm

Max Torque

12.75 Nm / 1.27 kgf-m / 9.4 lb/ft @ 4500 rpm


4 Speed, grip-shift, constant mesh
Final Drive Direct drive
Frame Pressed sheet steel, streamlined monocoque structure

Front Brakes

150 mm drum

Rear Brakes

150 mm drum
Wheels Interchangeable

Front Tyre

3.0 x 10"

Rear Tyre

3.0 x 10"

Dry Weight

85 kg / 187 lbs

Fuel Capacity 

7.7 L / 2 US gal


1.2 L / 0.3 US gal

Consumption  average

2.1 L/100 km / 48 km/l / 111 US mpg

Top Speed

95 km/h / 59 mph


Red, Blue, Black, Maroon, White, Silver


The Vespa Cosa was initially to be called the Vespa R (standing for Rinnovata, meaning "revised"). It was unveiled at the Milan Motorcycle Show in 1987. The Cosa is a direct successor to the Vespa PX series, and although the internal workings are largely similar, it came with newly developed gearbox that was a significant improvement upon the gearbox that had previously been used in the PX series. The PX series was still in production at the time, however, and has continued production even after Cosa production was discontinued. Other improvements upon the PX series included storage space beneath the seat and anti-lock brakes on the front wheel. More controversially, it was also the first Vespa to utilise a significant amount of plastic parts in addition to the traditional monocoque pressed steel frame.

The series is broadly divided into two generations. The first generation was built from 1988 to 1991, while the second generation (sometimes referred to as the Cosa FL) was in production from 1992 onwards. Both version are fundamentally the same, with some minor differences. Firstly, the clutch was modified so that it would be easier to pull in and release. Secondly, minor design alterations were made: the tail light was slightly different and moved to a new position, the seat lock was installed on the side of the saddle, and the saddle was widened for extra comfort.

Drawing by the designer Paolo Martin

While the engine is virtually identical to that of the Vespa PX series of the time, there are three major differences in the design:

  • The swingarm pivot on the Cosa is wider than that of the PX.
  • The rear spring strut on the engine housing is shaped differently. This is because the rear suspension of Cosa is longer than that of the PX.
  • The mounting for the rear brake is different due to the hydraulic rear brake.

In addition, the carburetor on the Vespa Cosa came stock fitted with an electronic fuel valve and automatic choke. It also had a digital tachometer (similar to that on later versions of the Vespa T5).