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BMW R12 Single Carb
1940Allround

BMW R12 Single Carb

Key specifications

Engine
745 cc
Power
18 HP
Fuel type
petrol
Fuel capacity
3.7 L
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1940 BMW R12 Single Carb motorcycle, a stunning blend of engineering and design that has firmly secured its place in the annals of motorcycle history. With its classic styling and robust performance, the R12 represents BMW's commitment to quality and innovation during a transformative era in the world of motorcycling. Positioned as an allround motorcycle, it appeals to riders who appreciate the melding of form and function, making it a timeless choice for collectors and enthusiasts alike. At the heart of the R12 is its impressive 745cc two-cylinder boxer engine, a hallmark of BMW's engineering prowess. Producing 18 horsepower at 3,400 RPM, this four-stroke powerhouse delivers a smooth and reliable ride, allowing for a top speed of 110 km/h (68.4 mph). The unique engine configuration not only enhances stability but also ensures a low center of gravity, which greatly contributes to the bike's handling characteristics. Coupled with a fuel consumption of just 3.40 litres per 100 km, this motorcycle offers both performance and efficiency, making it an attractive option for long-distance touring or leisurely weekend rides. The R12 is laden with features that reflect the advanced technology of its time. Its steel-pressed-loop frame provides both strength and durability, while the telescopic front fork offers a smooth ride, absorbing bumps with ease. The drum brakes, measuring 200 mm at both the front and rear, deliver reliable stopping power, ensuring safety on various terrains. Additionally, the kick starter mechanism adds a classic touch, allowing riders to connect with the motorcycle's vintage roots while enjoying the thrill of the open road. The bike's compact dimensions, with a length of 2,100 mm and a width of 900 mm, ensure it remains nimble and easy to maneuver, whether in the city or on winding country roads. In summary, the 1940 BMW R12 Single Carb continues to capture the hearts of motorcycle enthusiasts with its blend of historical significance, classic performance, and enduring craftsmanship. Whether you're a seasoned rider or a budding collector, this motorcycle offers a unique riding experience that pays homage to the golden age of motorcycling while remaining relevant in today's landscape.

Pros

  • Timeless Design: The classic aesthetic and iconic styling of the R12 make it a beautiful addition to any motorcycle collection.
  • Efficient Fuel Consumption: With a consumption rate of 3.40 litres/100 km, this motorcycle allows for longer rides without frequent refueling stops.
  • Solid Performance: The boxer engine configuration provides excellent stability and handling, making for an enjoyable riding experience.

Cons

  • Limited Power Output: At 18 HP, the R12 may not satisfy riders seeking high-performance thrills or rapid acceleration.
  • Weight and Size: Some may find the bike's relatively hefty frame and dimensions less suited for tight, urban riding conditions.
  • Kick Starter Only: The absence of an electric starter can be a drawback for those unfamiliar with kick-starting techniques or seeking a more modern convenience.

Technical details

Source specification data

Make
BMW
Model
R12 Single Carb
Category
Allround
Starter
Kick
Power
18.00 HP (13.1 kW)) @ 3400 RPM
Ignition
Magneto
Top Speed
110.0 km/h (68.4 mph)
Fuel System
Carburettor
Bore X Stroke
78.0 x 78.0 mm (3.1 x 3.1 inches)
Compression
5.2:1
Displacement
745.00 ccm (45.46 cubic inches)
Engine Details
Two cylinder boxer, four-stroke
Fuel Consumption
3.40 litres/100 km (29.4 km/l or 69.18 mpg)
Greenhouse Gases
O2
g/km. (
O2
-
Carbon
dioxide emission)
Lubrication System
Forced feed
Fuel Capacity
14.00 litres (3.70 gallons)
Overall Width
900 mm (35.4 inches)
Overall Height
940 mm (37.0 inches)
Overall Length
2,100 mm (82.7 inches)
Seat
Single seat
Rear Tyre
3.5-19
Frame Type
Steel-pressed-loop
Front Tyre
3.5-19
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
Rigid-
Front Suspension
Telescopic fork
Rear Brakes Diameter
200 mm (7.9 inches)
Front Brakes Diameter
200 mm (7.9 inches)