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BSA B32

Make Model	BSA B32
Year	1949
Engine	Four stroke, single cylinder, Overhead valve
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

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.