BSA Royal Star — Wikipedia, the free encyclopedia

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BSA A 50 Royal Star

BSA Royal Star

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

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The decision by Lucas in the 1950s to switch production of electrical components (from systems to alternators/coil systems) British motorcycle manufacturers to redesign their engines. and BSA took the opportunity to move pre-unit and semi-unit construction to unit construction, that is, the engine and gearbox together in an casting. At the same time, Bob Managing Director and General of BSA recognised the need for an updated that built on the best of the A10 but

which would succeed in the lucrative but competitive United market. Working with Development Engineer Bert they developed the unit Star twins . Launched in the as the 500cc BSA Star and later the sporty Royal Star The was widely exported to the USA and Australia as as becoming a top seller in the UK in the early [ 1 ]

The Royal Star had a relatively 1 single Amal monobloc and later Concentric carburettor, but in new 8.5:1 pistons and a new gearbox performance. The machine had a top speed of 90mph and was relatively free of Sharing common engine and parts with the larger BSA A65 650 twin, it was an over-engineered machine and very robust.

The only major fault the engine design was a plain bearing on the timing side when worn, would a drop in oil pressure. In 1965, BSA the bearing issues with a bearing on the drive side, as it had on the pre-unit engines, with an bronze bushing on the timing [ 2 ]

BSA A 50 Royal Star

The Cyclone was the same basic as the Royal Star except for high performance. The A50CC Competition built for the US market year 1964 had dual 1 carburettors, higher 10.5:1 compression, magneto ignition, front brake, 2 gallon tank and upswept open Built for scrambles, this had no road lights.

The A50C Road built for the US market years 1964 and 1965 had 1 dual carburettors, higher 9:1 engine and larger front This model had battery full road lighting and the 2 gallon fuel tank. models were available for the UK with 9:1 engine compression, ingition and 4 gallon fuel

Notes [ edit ]

^ ‘ R.M. BSA Twins 1962 1973 . Brooklands Books ISBN 1-85520-337-5. ^ Clement (July/August 2011). 1962 BSA A50 Star. Motorcycle Classics. 2011-07-18. Check date in: |date= (help )

BSA A 50 Royal Star

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