| MODEL | AERMACCHI HD 150 ZEFFIRO 1956 |
| Year | 1956 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 148 cc / 9.03 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 hp @ 4500 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | Carburettor (Dell'Orto) |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 3-speed |
| Clutch | Wet multiplate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic fork |
| Rear Suspension | — |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 92 kg / 202.8 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3-17 |
| Rear Tyre | 3-17 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 90 km/h / 55.9 mph |
The Zeffiro 150 is the larger-bore sibling of the 125, a 148 cc two-stroke with the same simple chassis and three-speed gearbox but slightly more power and a higher top speed. Like the 125 it was aimed at economical urban and light touring use.
