| MODEL | BSA B40 STAR 350 1961 - 1967 |
| Year | 1961 - 1967 |
| Engine Type | Single cylinder, OHV, four-stroke, air-cooled |
| Displacement / Capacity | 343 cc |
| Bore X Stroke | 79 mm x 70 mm |
| Compression Ratio | 7:1 |
| Cooling System | Air |
| Max Power | 21 bhp @ 7000 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | — |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4-speed |
| Clutch | Wet, multi-plate |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | Single cradle |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swinging arm |
| Front Brakes | Drum, 7 in |
| Rear Brakes | — |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1360 mm |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 75 mph (cruising 50-55 mph) |
The civilian 350 unit-construction single, a bigger relative of the C15 with a four-speed gearbox and a sturdy cradle frame. It was an everyday road bike rather than a sports model and became the basis of the SS90 and the military B40.
