1966 BSA 654cc Thunderbolt
Lot 583
1966 BSA 654cc Thunderbolt
Sold for £2,127 (US$ 3,453) inc. premium

Lot Details
1966 BSA 654cc Thunderbolt
Registration no. GHW 543D
Frame no. 3925
Engine no. 3925
Following Triumph’s lead, BSA turned to unit construction for its range of parallel twin as the 1960s dawned, launching the all-new 500cc A50 and 650cc A65 Star models in January 1962. The basic architecture of the preceding A7/A10 was retained, so the new engine remained an air-cooled parallel twin with 360-degree crankshaft and single camshaft mounted at the rear of the cylinder block. The cycle parts were much as before, comprising a duplex loop, swinging-arm frame fitted with telescopic front fork. The first high-performance variant - the A65R Rocket - arrived in October 1963, only to be superseded the following year by the Lightning, the first of the unit-construction twins (along with its A50 equivalent, the Cyclone) to be equipped with the new splayed-port, twin-carburettor cylinder head. Cycle parts remained unaltered except for the adoption of a 19" front wheel. For 1965 the Star tourers were replaced by the A50 Royal Star and A65 Thunderbolt, both of which came with a single Amal Monobloc carburettor. The single-carb twin was preferred by many riders, being more economical, easier to keep in tune and only marginally less powerful than the twin-carb version. This A65 Thunderbolt has been in the same family ownership for the past 29 years. Restored around 1980 and reported to incorporate some Lightning parts, the machine is described by the private vendor as in ‘excellent’ condition and offered with Swansea V5.
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