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Information: -BSA model B31
- Q.D wheel type
modifications; Stainless valves, Bonny piston (420cc, 8.5 to 1 compression ratio) + bonny clutch.
replaced parts; tyres, wiring loom, chains, cables, exhaust system, rebuilt mag, dynamo, head race bearings, fork seals + bushes, new ancillaries, rubbers, grips and levers.
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