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BSA A 50 Royal Star 1970

Engine and transmission
Engine type: 2 cylinders, 4-stroke, Inline
Displacement: 498 cc (30.43 cubic inches)
Bore × stroke: 2.58 inch × 2.91 inch (undersquare - longstroke)
Cooling system: Air cooled
Power: 32.77 HP (24.1 kW) @ 6500 rpm
Throttle: Cable operated
Valves
Valve train: OHV, variable
Valves per cylinder: 2
Fuel and ignition
Sparks per cylinder: 1
Fuel supply system: Carburetor
Ignition type: mechanically timed
Compression: 9:1
Engine mounting: Transverse
Lubrication system: Wet sump
Gear box: Manual 4-speed
Clutch: Wet, multiple discs, cable operated
Final drive: Chain
Spark plug pipe type: NGK
Motor oil: Mineral, 10W/40
Starter: Kick-starter
Dimensions
Weight
Curb weight: 425.5 lbs
Dry weight: 392.4 lbs
Chassis and suspension
Frame type: iron, Single cradle frame
Front
Suspension: Cartridge
Brake: Single Drum
Tire: 83 / 100 R19
Tire pressure: 0.12 PSI
Rear
Suspension: twin shock, Swingarm
Brake: Drum
Tire: 89 / 100 R19
Tire pressure: 0.14 PSI
Other
ABS available: No
Power-to-weight ratio: 0.12 KW/lbs (8.01 lbs/HP)
Acceleration (0-60 mph): 7.8 sec
Top speed: 90.1 mph
Fuel capacity: 3.96 gals
Number of riders: 2 persons

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