BSA 1955ca Gold Star 499 cc 1 cyl OHV 3407



BSA 1955ca “Gold Star” 499 cc OHV frame # CA7 11346 engine # DBD.34.5011
Top model for 1939 in the BSA range was the M24 Gold Star, the ultimate sportsman’s dream. It had bore x stroke dimensions of 82×94 mm, a foot-controlled 4-speed gearbox and a specially tuned engine, individually built and bench tested. It was fitted with an aluminium cylinder and head and Amal TT carburetter.
The Gold Star name was derived from the award won on 30th June 1937 by the great Wall Handley who achieved a 100mph lap of the Brooklands circuit on a specially prepared 500cc Empire Star model. The super sports Gold Star model would become one of the most successful production racing motorcycles ever and the post-war Gold Star formed the mainstay of clubman’s racing in the 1950s.
The Gold Star returned as a 350cc model with bore x stroke of 71x88mm in BSA’s post-WW2 range at the end of 1948. For 1950 a 500cc version – the B34 – with 85x88mm bore x stroke was added and this larger Goldie was the first to switch to the new die-cast top-end, with separate rocker box, in 1951. The change to to ‘CB’ designation in 1954 marked the introduction of the classic ‘big fin’ engine top end but the designation lasted only until the arrival of the ‘DB’ series in 1955. The ‘DB’ incorporated a much improved lubrication system.
The machine we present here has been part of a private BSA collection since 1987 and invoices on file show that some 5500 Dutch guilders (ca €2500) was spent at the time for parts and services. This included a new crankshaft and belt drive kit. The frame number is on an unusual place. Smiths 120 mph speedo and 8000 rpm rev counter are fitted. As this fast sports machine has been standing for a long period some recommissioning may be required.