1953
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| Manufacturer | BSA |
|---|---|
| Also called | M 21 |
| Production | 1937 - 1956 |
| Class | Classic |
| Engine | single cylinder, four-stroke |
| Bore / Stroke | 82.0mm x 112.0mm |
| Compression ratio | 5.0:1 |
| Horse Power | 14.62 HP (10.9 KW) @ 4000RPM |
| Ignition type | magneto |
| Transmission | Gear box: 4-speed, manual Final Drive: chain |
| Suspension | Front: hydraulic telescopic Rear: twin shock |
| Brakes | Front: expanding brake (drum brake) Rear: expanding brake (drum brake) |
| Front Tire | 3.25-19 |
| Rear Tire | 3.25-19 |
| Wheelbase | 54.02 inches (1372 mm) |
| Dimensions | L 85.79 inches (2179 mm) W 29.09 inches (739 mm) |
| Seat height | 28.5 inches (724 mm) |
| Weight | 396.83 pounds (180.0 Kg) (dry), 167.0 kg (wet) |
| Fuel capacity | 3.0 Gallon (11.36 Liters) |
| Manuals | Service Manual |
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The BSA M21 was a single cylinder, four-stroke Classic motorcycle produced by BSA between 1937 and 1956. Claimed horsepower was 14.62 HP (10.9 KW) @ 4000 RPM.
Engine
A 82.0mm bore x 112.0mm stroke result in a displacement of just 591.0 cubic centimeters. Fuel was supplied via a sidevalves.
Drive
The bike has a 4-speed, manual transmission. Power was moderated via the wet multiplate.
Chassis
It came with a 3.25-19 front tire and a 3.25-19 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a hydraulic telescopic while the rear was equipped with a twin shock. The M21 was fitted with a 3.0 Gallon (11.36 Liters) fuel tank. The bike weighed just 396.83 pounds (180.0 Kg). The wheelbase was 54.02 inches (1372 mm) long.
1937 - 1961 BSA M21
The M21 from British manufacturer BSA sports an air-cooled, four-stroke, 591cc, single cylinder powerplant mated to a four-speed manual transmission that can reach a maximum power output of 15 horsepower at 4200 rpm. Standard fittings for this classic machine include laced wheels, drum brakes in the front and in the rear, a large headlight, a hard-tail rear suspension, a single spring girder fork in the front, a sprung single seat and a chromed exhaust system.