BMW R12
Manufacturer | BMW |
---|---|
Also called | R12 Single Carb, R12 Twin carb, R 12 |
Production | 1935 - 1942 |
Predecessor | BMW R11 |
Class | Classic |
Engine | two cylinder boxer, four-stroke |
Bore / Stroke | 78.0mm x 78.0mm |
Compression ratio | 5.2:1 |
Top speed | 68 mph (110 km/h) |
Horse Power | 17.57 HP (13.1 KW) @ 3400RPM |
Ignition type | magneto |
Battery | 5.2:1 |
Transmission | Gear box: 4-speed Final Drive: shaft |
Suspension | Front: telescopic fork Rear: rigid- |
Brakes | Front: expanding brake (drum brake) Rear: expanding brake (drum brake) |
Front Tire | 3.5-19 |
Rear Tire | 3.5-19 |
Wheelbase | 54.33 inches (1380 mm) |
Dimensions | L 82.68 inches (2100 mm) W 35.43 inches (900 mm) H 37.01 inches (940 mm) |
Weight | 407.86 pounds (185.0 Kg) (dry), 185.0 kg (wet) |
Fuel capacity | 3.7 Gallon (14.00 Liters) |
Fuel consumption | 3.40 liters/100 km (29.4 km/l or 69.18 mpg) |
Related | BMW R17 |
Manuals | Service Manual |
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The BMW R12 Single Carb was a two cylinder boxer, four-stroke Classic motorcycle produced by BMW between 1935 and 1942. It could reach a top speed of 68 mph (110 km/h). Claimed horsepower was 17.57 HP (13.1 KW) @ 3400 RPM.
History
The R12 along with its sister model, the R17 were milestone models in the evolution of motorcycling, being the first production machines to feature a hydraulically dampened telescopic front fork. This resulted in the R12 being the best selling pre-WWII BMW motorcycle, with 36,000 units sold from 1935 to 1942, with a great many going into military service.
Engine
The engine was a air cooled two cylinder boxer, four-stroke. A 78.0mm bore x 78.0mm stroke result in a displacement of just 745.0 cubic centimeters. Fuel was supplied via a standing valves.
Drive
The bike has a 4-speed transmission. Power was moderated via the dry multiplate-cable operated.
Chassis
It came with a 3.5-19 front tire and a 3.5-19 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 telescopic fork while the rear was equipped with a rigid-. The R12 Single Carb was fitted with a 3.7 Gallon (14.00 Liters) fuel tank. The bike weighed just 407.86 pounds (185.0 Kg). The wheelbase was 54.33 inches (1380 mm) long.
1935 - 1942 BMW R 12
The 1935 BMW R 12 has, at its heart, an air-cooled, four-stroke, 745cc, twin cylinder powerplant mated to a four-speed manual transmission and can produce a claimed 20 horsepower at 4000 rpm. It also comes with laced wheels, a large, round headlamp, a rear luggage rack, a telescopic front fork, a hard-tail rear suspension with a sprung single saddle, a drum braking system in the front and in the rear, a dual exhaust and a dry, double plate clutch.
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