BSA M20 (1955-61)

Make Model: BSA M20


Year: 1955 – 61
Engine: Four stroke, single cylinder, side valve
Capacity: 496 cc / 30.3 in
Bore x Stroke: 82 x 94 mm
Cooling System: Air cooled
Compression Ratio: 4.9:1
Oil Capacity: 3.4 L / 7.2 US pints
Carburetor: 1937-38: Amal 76, 1939-45: Amal 276, 1945 onward: Amal monobloc
Exhaust: Single, chrome
Ignition: Magdyno
Battery: 6 V (except for AA models: 12 V)
Starting: Kick
Max Power: 9.6 kW / 13 hp @ 4200 rpm
Clutch: Multi-plate, dry
Transmission: 4-Speed
Final Drive: Chain
Gear Ratios: Solo: 1st 15.8 / 2nd 10.9 / 3rd 7.0 / 4th 5.3:1 Sidecar model: 1st 17.6 / 2nd 12.2 / 3rd 7.8 / 4th 5.9:1
Frame: Twin cradle
Front Suspension: Up to 1947: Girder After 1947: Telefork
Rear Suspension: None, spring loaded saddle
Front Brakes: Drum, 7 in

Rear Brakes: Drum, 7 in
Wheels: Steel, wire spokes
Front Tyre: 3.25 x 19 in
Rear Tyre: 3.50 x 19 in
Dimensions: Length: 2180 mm / 85.8 m Width: 740 mm / 29.1 in
Wheelbase: 1372 mm / 54 in (1937 model)
Ground Clearance: 120 mm / 4.7 in
Saddle Height: 724 mm / 28.5 in
Dry Weight: 167 kg / 369 lbs
Fuel Capacity: 13.6 L / 3.6 US gal
Average Consumption: 4.3 L/100 km / 23.4 km/l / 55 mph
Top Speed: 80.5 km/h / 50 mph
Colours: Black and chrome with green tank and gold lining
Source: Wikipedia


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