GoogleCustom Search

BSA A7 Star Twin Gallery

BSA had introduced their rival to the Triumph Speed Twin, the A7, during September 1946, an unusual feature of the new machine being the gearbox which bolted to the back of the crankcases, suggesting unit construction. A sports variant was added for 1949 to counter the success of the Triumph Tiger 100. Called the Star Twin the new model featured a twin carburettor head and a raised compression ratio. The revised engine was fitted to the new plunger equipped frame and finished with a silver and chrome petrol tank and wheels.

Bike Image Description
1947 BSA A7 Star Twin 1947 BSA A7 Star Twin Rigid frame.
1948 BSA A7 1948 BSA A7

500cc, 170kg.

 

1948 BSA A7 500 ccm Parallel-Twin 1948 BSA A7 500 ccm Parallel-Twin  
1949 BSA Star Twin BSA Star Twin  
1949 BSA A7 Star Twin BSA A7 Star Twin

 

Image provided by www.classic-auctions.com.

1950 BSA A7 Star Twin 1950 BSA A7 Star Twin  
1953 BSA A7 Plunger BSA A7 Plunger 500cc twin.
1953 BSA A7 Star Twin 1953 BSA A7 Star Twin
1954 BSA A7 BSA A7

During October 1949 BSA announced the introduction of a new 650cc twin cylinder model, the A10. Although sharing a family resemblance with the existing A7 500cc twin, it featured a revised engine design with very little in common with the earlier 500cc which was quickly replaced by a new A7 derived from the A10. Both versions of the new twin were offered with a choice of rigid or plunger frames until 1954 and the introduction of a pivoted fork frame. The introduction of the new frame also brought about a change to the gearbox which had previously been attached to the rear of the crankcases, but which now became a separate item.

Image provided by www.classic-auctions.com.

1955 BSA A7 1955 BSA A7 Top end overhall, new valves, valve springs and piston rings. Magnetto, carburettor and dynamo overhall.
1956 BSA A7 1956 BSA A7  
1956 BSA A7 BSA A7 500cc, twin-cylinder.
1957 BSA A7 SS 1957 BSA A7 SS  
1959 BSA A7 SS 1959 BSA A7 SS  
1959 BSA A7 Shooting Star 1959 BSA A7 Shooting Star  
1962 BSA A7 SS BSA A7 SS Shooting Star.

Please e-mail the webmaster if you have a picture worth adding to our database, e-mail: webmaster@motorbike-search-engine.co.uk