The History

BSA's classic pre-unit supersports 650 was only manufactured in 1962 and 1963 and has inspired hundreds of enthusiasts to build replicas.  At the end of the production run for the 650 pre-unit motor, just before the A65 was introduced, BSA’s customers were clamouring for a top of the range sportster. BSA based their stop-gap superbike on Eddie Dow’s inspired idea which involved fitting a tuned A10 engine into the Gold Star single chassis.

The specification of each machine depended very much on the customer’s requirements. Compression could be raised from 9:1 to 10.5:1, and the high-lift Spitfire cam raised power to 46bhp. Fitted with a racing exhaust, a Rocket Gold Star could output 50bhp. 

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Rocket Gold Star production ended in 1963 due to the development of new unit construction  successors, designated as A65 650 cc

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This Bike

Our bike uses a BSA A10R engine which has been fully rebuilt with new pistons, bearings, valves etc, it uses 12 volt alternator for charging and Lucas racing magnito for ignition, for reliability a Bob Newby belt drive clutch has been fitted, the forks have new bushes/seals and the improved internal dampers fitted along with the famous Eddie Dow Superleggra alloy top yoke.

 

Front brake is the famous 7 inch single sided BSA unit, and the rear is standard RGS quick detachable unit, both wheels having 19 inch allow rims fitted

 

The bike is being built for road use, but may be used at some classic parades 

New Amal 28mm performance carburettors are fitted with air filters 

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The bike has been built deliberately not 100% to original spec because we wanted it to be useable classic in todays world. 

 

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