Difference between revisions of "BSA M21"
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{{Motorcycle | {{Motorcycle | ||
|name = | |name = BSA M21 | ||
|photo= 1953-BSA-M21-Maroon-2746-0.jpg | |photo= 1953-BSA-M21-Maroon-2746-0.jpg | ||
|aka = M 21 | |aka = M 21 | ||
|manufacturer = | |manufacturer = BSA | ||
|parent_company = | |parent_company = | ||
|production = 1937 - 1956 | |production = 1937 - 1956 | ||
Line 22: | Line 22: | ||
|predecessor = | |predecessor = | ||
|successor = | |successor = | ||
|class = | |class = Classic | ||
|engine = single cylinder, four-stroke | |engine = single cylinder, four-stroke | ||
|bore_stroke = 82.0mm x 112.0mm | |bore_stroke = 82.0mm x 112.0mm |
Latest revision as of 20:11, 23 November 2019
1953[edit | edit source]
External Links[edit | edit source]
BSA M21 | |
Manufacturer | |
---|---|
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 |
Horsepower | 14.62 HP (10.9 KW) @ 4000RPM |
Ignition | 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) |
Length | 85.79 inches (2179 mm) |
Width | 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 |
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[edit | edit source]
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[edit | edit source]
The bike has a 4-speed, manual transmission. Power was moderated via the wet multiplate.
Chassis[edit | edit source]
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[edit | edit source]
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.