| MODEL | BSA A70L LIGHTNING 750 1971 |
| Year | 1971 |
| Engine Type | Parallel twin, OHV, four-stroke, air-cooled |
| Displacement / Capacity | 751 cc |
| Bore X Stroke | 75 mm x 85 mm |
| Compression Ratio | 9.5:1 |
| Cooling System | Air |
| Max Power | 52 hp @ 6250 rpm (estimated) |
| Max Torque | — |
| Ignition | — |
| Induction | Two Amal 930 Concentric carburettors |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | — |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | Oil-in-frame P39 chassis shared with Triumph |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | — |
| Rear Brakes | — |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 177 kg / 390 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | 11.3 Litres / 3 gal |
| Fuel Consumption | — |
| Top Speed | 120 mph (estimated) |
The 750 cc version of the Lightning, made by lengthening the A65 stroke by 11 mm. Only about 200 were built, as a homologation special so BSA could race the bigger engine in American Class C events, and it came in the new oil-in-frame chassis.
