| MODEL | BSA BANTAM D3 MAJOR 1954 - 1957 |
| Year | 1954 - 1957 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 148 cc |
| Bore X Stroke | — |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | 5.3 bhp |
| Max Torque | — |
| Ignition | — |
| Induction | — |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 3-speed |
| Clutch | — |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | Drum, 4.5 in |
| Rear Brakes | Drum, 4.5 in |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | 1.75 Imperial gal / 8.0 Litres |
| Fuel Consumption | — |
| Top Speed | 50 mph / 80 km/h |
The Bantam Major enlarged the little two-stroke to 148 cc and gave it a bit more power and speed than the D1. It also brought an all-welded swinging-arm frame, a real step up in comfort over the earlier rigid and plunger machines.
