BSA B31
| Production Year: | 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959 |  |
| Type: | air-cooled, four-stroke, single cylinder, OHV |
| engine specs | |
| Type | air-cooled, four-stroke, single cylinder, OHV |
| Displacement | 348 cm3 |
| Bore X Stroke | 2.8x3.5 in OR 71 mm |
| Compression Ratio | 6.5:1 |
| transmission specs | |
| Gearbox | 4-speed, manual |
| Clutch | multi-plate |
| Final Drive | chain |
| chassis specs | |
| Frame | steel |
| Front Suspension | telescopic fork |
| Rear Suspension | plunger shocks |
| Front Brake | drum |
| Rear Brake | drum |
| dimension specs | |
| Weight | 386 lbs OR 175 kg |
| Fuel Capacity | 5 gallons OR 18.9 L |
| tyres specs | |
| Front | 3.25 x 19 |
| Rear | 3.5 x 19 |
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