AA (1937-61)

Make Model: AA (M20 & M21) (M21 specifications recorded. Click here for M20 specifications)


Year: 1937 – 61
Engine: Four stroke, single cylinder, side valve
Capacity: 591 cc / 36.1 in
Bore x Stroke: Up to 1938: 85 x 105 mm After 1938: 82 x 112 mm
Cooling System: Air cooled
Compression Ratio: 5.0:1
Oil Capacity: 2.4 L / 5 US pints
Carburetor: 1937-38: Amal 76, 1939-45: Amal 276, 1945 onward: Amal monobloc
Exhaust: Single, chrome
Induction: Aspirated
Ignition: Magdyno
Battery: 12 V
Starting: Kick
Max Power: 11 kW / 15 hp @ 4200 rpm
Clutch: Multi-plate, dry
Transmission: 4-Speed
Final Drive: Chain
Frame: Twin cradle
Front Suspension: Up to 1947: Girder After 1947: Telefork
Rear Suspension: Up to 1947: None, spring loaded saddle After 1947: Plunger type
Front Brakes: Up to 1955: Drum, 7 in After 1956: Drum, 8 in

Rear Brakes: Drum, 7 in
Wheels: Steel, laced 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
Dry Weight: 167 kg / 369 lbs
Fuel Capacity: 11.4 L / 3 US gal
Source: Wikipedia


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