
BSA A 50 Royal Star
The 1970 BSA A 50 Royal Star is a stylish and Classic motorcycle with Air cooled, 498cc, OHV and 32.77 HP (24.1 kW) @ 6500 rpm.
Technical Specifications
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
- Valve train:OHV, variable
- Valves per cylinder:2
- 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
- Curb weight:425.5 lbs
- Dry weight:392.4 lbs
Chassis and suspension
- FrontSuspension:CartridgeBrake:Single DrumTire:83 / 100 R19Tire pressure:0.12 PSI
- RearSuspension:twin shock, SwingarmBrake:DrumTire:89 / 100 R19Tire pressure:0.14 PSI
- Frame type:iron, Single cradle frame
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