BSA A50 Royal Star: history, specs, pictures

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BSA A50 Royal Star
Also called A 50 Royal Star
Production 1963 - 1970
twin, four-stroke
Bore / Stroke 65.5mm x 74.0mm
Top Speed 90 mph (145 km/h)
Horsepower 32.32 HP (24.1 KW) @ 6500RPM
Fuel System carburetor
Transmission Gear box: 4-speed

Final Drive: chain

Clutch: wet multiplate
Suspension Front: hydralic telescopic forks
Rear: twin shock
Brakes Front: expanding brake
Rear: expanding brake
Front Tire 3.25-19
Rear Tire 3.50-19
Wheelbase 54.76 inches (1391 mm)
Weight 178.0 kg (wet)
Fuel Capacity 3.96 Gallon (15.00 Liters)
Manuals Service Manual

The BSA A50 Royal Star was a twin, four-stroke standard produced by BSA between 1963 and 1970. It could reach a top speed of 90 mph (145 km/h). Claimed horsepower was 32.32 HP (24.1 KW) @ 6500 RPM.


The engine was a air cooled twin, four-stroke. A 65.5mm bore x 74.0mm stroke result in a displacement of just 498.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).


The bike has a 4-speed transmission. Power was moderated via the wet multiplate.


It came with a 3.25-19 front tire and a 3.50-19 rear tire. Stopping was achieved via expanding brake in the front and a expanding brake in the rear. The front suspension was a hydralic telescopic forks while the rear was equipped with a twin shock. The A50 Royal Star was fitted with a 3.96 Gallon (15.00 Liters) fuel tank. The wheelbase was 54.76 inches (1391 mm) long.