| MODEL | BSA L 349 1923 |
| Year | 1923 |
| Engine Type | Single-cylinder four-stroke, side-valve or overhead-valve |
| Displacement / Capacity | 349 cc |
| Bore X Stroke | 72 mm x 85.5 mm |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | 2.75 hp (rating) |
| Max Torque | — |
| Ignition | Chain-driven magneto |
| Induction | — |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | Mechanical oil pump with sight glass |
| Gear Box | Three-speed, hand change |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | Dummy rim brake |
| Rear Brakes | Dummy rim brake |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 26 x 2.25 in |
| Rear Tyre | 26 x 2.25 in |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
The Model L was BSA's 349 cc medium-weight single, offered with side-valve or overhead-valve engines on the same chassis. The overhead-valve version was the company's first overhead-valve production machine.
