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BMW R12 Single Carb
1942Allround

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 1942 BMW R12 Single Carb, a legendary motorcycle that encapsulates the spirit of post-war engineering and wartime resilience. Positioned as an allrounder, the R12 is a testament to BMW's commitment to innovation and quality during a tumultuous period in history. With its iconic two-cylinder boxer engine, this motorcycle is not just a mode of transport; it's a piece of history that embodies the essence of freedom on two wheels. As one of the first models to feature a telescopic fork and a robust, steel-pressed loop frame, the R12 has earned its place in the hearts of motorcycle enthusiasts and collectors alike. Under the hood, the R12 packs a punch with its 745cc four-stroke engine, delivering 18 horsepower at 3400 RPM. This power translates into a top speed of 110 km/h (68.4 mph), making it a formidable contender on the open road. The bike’s impressive fuel efficiency of 3.4 liters per 100 km (approximately 69.18 MPG) ensures that riders can enjoy extended journeys without frequent stops at the pump. The boxer engine's unique design not only contributes to a lower center of gravity but also provides a distinct, throaty growl that is music to the ears of any motorcycle aficionado. With a compression ratio of 5.2:1, the R12 offers a smooth, comfortable ride, ideal for both leisurely exploration and spirited rides. The R12 is adorned with features that showcase the era's ingenuity. Its sturdy steel-pressed loop frame provides exceptional stability and durability, while the 200 mm expanding drum brakes at both the front and rear ensure reliable stopping power. The telescopic front fork enhances ride comfort and handling, allowing riders to navigate various terrains with ease. The classic kick starter adds to the vintage charm of this motorcycle, ensuring that each ride begins with a touch of nostalgia. With a fuel capacity of 14 liters (3.7 gallons), the R12 is designed for adventure, ready to take you on long journeys with confidence. **

Pros

  • Timeless Design: The R12’s classic aesthetics and robust build make it a highly sought-after collector’s item.
  • Impressive Fuel Economy: With a fuel consumption of just 3.4 liters per 100 km, riders can enjoy longer rides with fewer stops.
  • Stable Handling: The telescopic front suspension combined with a rigid rear ensures a smooth ride, providing confidence in various conditions.

Cons

  • Limited Power: With only 18 HP, the R12 may feel underpowered for modern highway speeds, limiting its appeal for those seeking a thrilling ride.
  • Manual Kick Start: The traditional kick starter can be less convenient compared to modern electric starters, especially for novice riders.
  • Maintenance Needs: As a vintage motorcycle, the R12 may require more frequent maintenance and care than contemporary models, which can be a deterrent for some riders.

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)
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)