| TECHNICAL SPECIFICATION |
|---|
| Model ID |
|---|
| Manufacturer (Make) | BSA |
| Model Name | A 50 Royal Star |
| Year | 1970 |
| Category(class) | Classic |
| Engine |
|---|
| Engine Capacity (Displacement) | 498 ccm (30.39 cubic inches) |
| Engine Type | Twin |
| Bore x Stroke | Ø65.5 mm x 74.0 mm (Ø2.58 inches x 2.91 inches) |
| Bore/Stroke Ratio | 0.89 |
| Stroke | 4 |
| Valves per Cylinder | 2 |
| Timing System | OHV |
| Cooling System | Air |
| Powertrain |
|---|
| Gearbox | 4 speed |
| Chassis/Suspension/Brakes |
|---|
| Front Brakes | Drum |
| Rear Brakes | Drum |
| Front Tire | 3.25-19 |
| Rear Tire | 3.50-19 |
| Dimensions |
|---|
| Curb Weight | 178 kg (392 lb) |
| Fuel Capacity | 15 litres (3.96 gallons) |
| Performance |
|---|
| Max Power | 33.00 HP (24.1 kW) at 6500 RPM |
| Power/Weight Ratio | 0.19 Hp/Kg |
| Top Speed | 145 km/h (90mph) |
| Acceleration (dart, speedup) time | |
| 0-100 km/h | 6.8 seconds |
| 0-60 mph | 6.5 seconds |
| 1/4 mile | - |
| 60 to 140 km/h, highest gear | - |
