Classic and Classy Motorcycles Ltd

Historical Context

The 1964 BSA A50 Star 500cc was part of BSA’s post-war middleweight twin lineup, designed to compete with Triumph’s 500 twins and offer a reliable, stylish, and sporty road bike for the emerging global market. Introduced in the early 1960s, the A50 Star was a development of the earlier A7 and featured modern styling, a unit construction engine, and a reputation for smooth, predictable performance. The 500cc category was hugely important at the time, especially in export markets like the USA, where riders wanted British charm in a more manageable package than the 650cc machines. The A50 Star was aimed at this market and delivered classic British engineering and aesthetics during BSA’s golden years.

Technical Specifications and Performance

• Year: 1964
• Make: BSA (Birmingham Small Arms Company)
• Model: A50 Star
• Engine Displacement: 499cc
• Engine Type: Air-cooled OHV parallel twin
• Compression Ratio: 8.5:1
• Carburetion: Amal Monobloc carburetor
• Ignition System: Points ignition with coil
• Transmission Type: 4-speed manual
• Final Drive: Chain
• Cooling System: Air-cooled
• Fuel Capacity: Approx. 3.5 gallons
• Braking System: Drum front and rear
• Dry Weight: Approx. 395 lbs
• Top Speed: Around 90–95 mph

Technical Advancements

One of the A50 Star’s most significant advancements over its predecessor was the move to unit construction—combining engine and gearbox into a single casing. This improved rigidity, reduced oil leaks, and gave the bike a more modern appearance. The engine featured a 360° firing order for classic British twin rhythm, and the dual down-tube frame gave it good stability at speed. Though modest in outright performance compared to larger 650cc bikes, the A50 excelled in rideability, especially on winding roads and through towns.

Evolution of the Model

The A50 Star was part of a broader BSA twin family that included sportier and touring-focused versions. Later models, such as the A50 Royal Star and A50 Cyclone, featured cosmetic upgrades and performance tweaks, but the early A50 Star laid the foundation. It bridged the gap between the old-school A7 and the more powerful A65 series that followed. In 1964, the A50 offered modern looks, decent performance, and a solid reputation for reliability, making it popular with commuters, weekend riders, and export buyers alike.

Competitors in the Market

In 1964, the A50 Star went up against Triumph’s 5TA Speed Twin, Norton’s 88SS, and the growing number of Japanese imports like the Honda CB72. While the Japanese machines offered electric start and improved refinement, the BSA held its ground with its classic design, rebuildable simplicity, and mechanical charm. The A50 also benefited from BSA’s strong dealer network and parts support, especially in the UK and U.S. markets.

Legacy and Appeal

Today, the 1964 BSA A50 Star is a highly collectible example of early 1960s British engineering. It appeals to classic bike fans who appreciate its simplicity, elegance, and solid performance. As a barn find or restoration candidate, the A50 is a great starting point—easy to work on, well supported by parts suppliers, and full of character. Once restored, it offers an authentic slice of mid-century British motorcycling that’s ideal for vintage runs, shows, or just enjoying a ride through the countryside.