| MODEL | BSA A65 FIREBIRD 650SS 1970 |
| Year | 1970 |
| Engine Type | Four-stroke parallel twin, OHV, dry sump |
| Displacement / Capacity | 654 cc / 39.9 cu in |
| Bore X Stroke | 75 x 74 mm |
| Compression Ratio | 9.0:1 |
| Cooling System | Air cooled |
| Max Power | 35.9 kW / 49 hp @ 7000 rpm |
| Max Torque | — |
| Ignition | Twin coil, Lucas 4CA |
| Induction | Twin Amal Monobloc 389/67 |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 4 speed |
| Clutch | Multi-plate, wet |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Steel tubing, cradle |
| Front Suspension | Telescopic forks with coil springs, hydraulically damped |
| Rear Suspension | Swingarm with coil springs, hydraulically damped |
| Front Brakes | Drum, 8 in (20.3 cm) |
| Rear Brakes | Drum, 7 in (17.8 cm) |
| DIMENSION SPECS | |
| Overall Length | 2060 mm / 81.0 in |
| Overall Width | 711 mm / 28 in |
| Overall Height | — |
| Seat Height | 838 mm / 33 in |
| Wheelbase | 1372 mm / 54 in |
| Ground Clearance | 178 mm / 7.0 in |
| Dry Weight | — |
| Wet Weight | 184 kg / 406 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.25 x 18 in |
| Rear Tyre | 4.00 x 18 in |
| FUEL SYSTEM | |
| Fuel Capacity | 18 Litres / 4.8 US gal (Europe); 9 Litres / 2.4 US gal (US) |
| Fuel Consumption | — |
| Top Speed | 169 km/h / 105 mph |
For 1970 the Firebird SS was the street-oriented variant of the A65 scrambler line, sharing the 650 twin's twin-carburettor engine with the Scrambler. Output rose to the 49 hp quoted for the later years of the model.
