| MODEL | LAMBRETTA 150D SERIES 3 1956 |
| Year | 1956 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 150 cc / 9.15 cu in |
| Bore X Stroke | 57 x 58 mm / 2.2 x 2.3 in |
| Compression Ratio | 6.5:1 |
| Cooling System | Air |
| Max Power | 4.4 kW / 6.0 hp @ 4750 rpm |
| Max Torque | — |
| Ignition | Contact breaker and points |
| Induction | Carburettor, Dell'Orto |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | 6% |
| Gear Box | 3-speed |
| Clutch | Hand changed |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | Tubular steel |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | Expanding (drum) |
| Rear Brakes | Expanding (drum) |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 74.8 kg / 165 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 4-8 |
| Rear Tyre | 4-8 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 78.9 km/h / 49 mph |
The 150D Series 3 kept the 150 cc engine and the same listed output as the Series 2, with a slightly leaner oil mix quoted by the source. It was a quick, practical scooter for its time.
