| MODEL | HERCULES 311 1951 |
| Year | 1951 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 123 cc / 7.51 cu in |
| Bore X Stroke | 52 x 58 mm / 2.0 x 2.3 in |
| Compression Ratio | — |
| Cooling System | Air |
| Max Power | 3.6 kW / 5 hp @ 5000 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | Bing 18 mm carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic |
| Rear Suspension | Rigid |
| Front Brakes | Drum (expanding) |
| Rear Brakes | Drum (expanding) |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 90 kg / 198.4 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 2.50-19 |
| Rear Tyre | 2.50-19 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 75 km/h / 46.6 mph |
A 123 cc two-stroke single from Hercules, stepping above the 98 cc models of the period. It has telescopic forks, a rigid rear and drum brakes, and was a lightweight commuter motorcycle of the early 1950s.
