| MODEL | VESPA P 150S / X 1978 - 1990 |
| Year | 1978 - 1990 |
| Engine Type | Two-stroke, single cylinder |
| Displacement / Capacity | 149 cc / 9.1 cu in |
| Bore X Stroke | 57.8 x 57 mm |
| Compression Ratio | 8.2:1 |
| Cooling System | Air cooled, forced |
| Max Power | 5.5 kW / 7.5 hp @ 5750 rpm |
| Max Torque | — |
| Ignition | Contact breaker and coil |
| Induction | Dell'Orto SI 20/20 D carburettor |
| Start System | Kick start |
| TRANSMISSION SPECS | |
| Lubrication | Pre-mix, 1:50 |
| Gear Box | 4 speed, grip-shift, constant mesh |
| Clutch | Wet, multiplate |
| Final Drive | Direct drive |
| CHASSIS SPECS | |
| Frame | Pressed sheet steel, streamlined monocoque |
| Front Suspension | Trailing arm, coil spring with damper |
| Rear Suspension | Coil spring with damper |
| Front Brakes | 125 mm drum |
| Rear Brakes | 127 mm drum |
| DIMENSION SPECS | |
| Overall Length | 1740 mm / 68.5 in |
| Overall Width | 670 mm / 26.4 in |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1200 mm / 47.2 in |
| Ground Clearance | — |
| Dry Weight | 98 kg / 216 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.5 x 8 in |
| Rear Tyre | 3.5 x 8 in |
| FUEL SYSTEM | |
| Fuel Capacity | 7.5 Litres / 2.0 US gal |
| Fuel Consumption | 2.1 L/100 km / 112 US mpg |
| Top Speed | 90 km/h / 56 mph |
The P 150 S and P 150 X were the smaller-engined versions of the new-line P-series that replaced the earlier Vespa frames in the late 1970s. They use a larger, more angular steel monocoque with a 150 cc two-stroke and 8-inch wheels, aimed at cheap everyday transport.
