M21
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Make Model | M21 |
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 | 3.4 L / 7.2 US pints |
Carburetor | 1937-38: Amal 76, 1939-45: Amal 276, 1945 onward: Amal monobloc |
Exhaust | Single, chrome |
Induction | Aspirated |
Ignition | Magdyno |
Battery | 6 V (except for AA models: 12 V) |
Starting | Kick |
Max Power | 11 kW / 15 hp @ 4200 rpm |
Clutch | Multi-plate, dry |
Transmission | 4-Speed |
Final Drive | Chain |
Gear Ratios | Solo: 1st 14.3 / 2nd 9.9 / 3rd 6.3 / 4th 4.8:1 Sidecar model: 1st 16.6 / 2nd 11.5 / 3rd 7.3 / 4th 5.6:1 |
Frame | Twin cradle with integral sidecar lugs |
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 |
Wheelbase | 1372 mm . 54 in. |
Ground Clearance | 117 mm / 4.6 in. |
Saddle Height | 724 m / 28.5 in. |
Dry Weight | 167 kg / 369 lbs |
Fuel Capacity | 13.6 L / 3.6 US gal |
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