The BSA Royal Star was a Birmingham Small Arms Company (BSA) motorcycle whose new engine design paved the way for a range of successful unit construction twins. As well as giving a clean look to the engine, with the pushrod passages part of the cylinder block casting, unit construction reduced the number of places oil could leak from.

2012年4月20日 · Low-built and light (some 40 lb lighter than the current counterparts), the latest in the Small Heath line-up are packed with power and as compact in appear­ance as only unit-construction of engine and gear box can achieve. Listed respectively as the A50 and A65 Stars, the two models are nomin­ally a five-hundred and a six-fifty.

2018年7月17日 · Then again, perhaps it was the tone of the advertising that had a lot to answer for – the A50 Royal Star was billed as ‘smooth, quiet, dependable – your best choice may be a Royal Star’. All a bit low-key at a time when the motorcycle world was teetering on the brink of the Superbike era…

2011年6月28日 · 1962 BSA A50 Royal Star Claimed power: 28.5hp @ 6,000rpm Top speed: 90mph (est.) Engine: 499cc OHV air-cooled parallel twin Weight (dry): 385lb (175kg) Price then: $775 (est.) Price now:$4,000-$6,000. In the late 1950s BSA was in a bit of a pickle.

2020年2月13日 · This 1969 BSA A50 Royal Star was acquired by the seller eight years ago following a refurbishment under previous ownership. The bike is powered by a numbers-matching 498cc parallel twin paired with a four-speed unit gearbox and has been refinished in blue and silver over a black frame.

The 1969 BSA A 50 Royal Star and all other motorcycles made 1894-2025. Specifications. Pictures. Rating. Discussions.

The machine had a top speed of about 90 mph and was relatively free of vibration. Sharing common engine and cycle parts with the larger BSA A65 Star 650 twin, it was an over-engineered machine and proved very robust.

1962 BSA A50 Royal Star specs, performance data, engine specifications, pictures.

2015年4月11日 · A semi-popular export, the BSA A50 Royal Star was an evolution of the A50 Star, which was an example of BSA's transition to full unit construction engines. The Royal Star had a 498cc twin that pushed 33 horsepower through a 4-speed transmission.

Heavy, mild, but stable and agile unit construction twin that has minimal vibes to match the minimal performance. Time has been kind to its looks and it can be reliable because it’s very hard to thrash them. Some tuned examples turning up as Yank imports, which don’t seem to blow their motor with the ease of the tuned 650’s.