BSA B32
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Make Model | BSA B32 |
Year | 1949 |
Engine | Single, OHV, 4-stroke |
Capacity | 348 cc / 21.2 cub in. |
Bore and Stroke | 71 x 88 mm |
Compression Ratio | 6.5:1 |
Cooling System | Air cooled |
Lubrication | Dry sump |
Exhaust | Single, stainless steel and chrome |
Carburetor | Single Amal Monobloc |
Ignition | Lucas magneto MO1L |
Starting | Kick start |
Clutch | Multi-plate |
Maximum Power | 16.2 kW / 22 hp @ 6000 rpm |
Transmission | 4-Speed manual |
Final Drive | Chain |
Front Wheel | WM2 x 19 in. |
Rear Wheel | WM2 x 19 in. |
Front Tyre | 3.25 x 19 in. Dunlop Gold Seal |
Rear Tyre | 3.5 x 19 in. Dunlop Gold Seal |
Front Suspension | Hydraulic fork |
Rear Suspension | Swinging arm fork with shocks |
Front Brake | 8 in., drum |
Rear Brake | 7 in., drum |
Wet Weight | 175 kg / 385 lbs |
Fuel Capacity | 19 L / 5 US gal |
Colours | Green/chrome plated tank and black frame |
Source | Bonhams |
BSA's rugged, workaday B31 was manufactured from 1945 to the end of 1959, its overhead-valve engine providing the basis for the renowned Gold Star sports roadster. At the time of its introduction, the B31 was BSA's sole all-new model, joining the lightweight 'C' and heavyweight 'M' ranges carried over from pre-war days, and was produced initially with rigid frame and telescopic front fork. In January 1946 it was joined by a Competition variant, the B32, which boasted a high-level exhaust system, 21" front wheel, additional chromium plating, a crankcase shield and lowered gearing. An alloy cylinder barrel and head, broadly similar to those used on the contemporary Gold Star but retaining a separate pushrod tunnel, became available as B32 options from 1949 onwards, as did plunger rear suspension in common with the rest of the 'B' singles range.