1957 BSA A7 Twin

Reader Contribution by The Motorcycle Classics Staff
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1957 BSA A7 Twin

Country: Great Britain
Engine: Air-cooled vertical twin 4-stroke
Ignition: Lucas magneto
Power Rating: 28hp @ 5,800rpm
Bore x Stroke: 66mm x 72.6mm
Displacement: 497cc
Valves: Overhead, pushrod activated
Fuel System: Single Amal Monobloc 15/16” bore carburetor
Transmission: 4-speed
Suspension: Front telescopic forks, rear twin shocks
Brakes: Front and rear drum
Weight: 425lb (dry)
Top Speed: 90mph

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