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BMW R12 Single Carb
1936Allround

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 1936 BMW R12 Single Carb, a motorcycle that elegantly bridges the gap between classic charm and cutting-edge engineering of its time. Positioned in the allround category, the R12 was designed to cater to the needs of both daily commuters and adventurous riders alike. With its iconic two-cylinder boxer engine and timeless design, this motorcycle has earned its place in the hearts of motorcycle enthusiasts and collectors. The R12 is not merely a machine; it is a testament to BMW's commitment to innovation and quality craftsmanship during the interwar period. Under the alluring exterior lies a robust 745cc four-stroke engine that produces 18 horsepower at 3400 RPM, delivering a top speed of 110 km/h (68.4 mph). This powerplant showcases BMW’s engineering prowess with a well-balanced compression ratio of 5.2:1, ensuring a smooth and responsive ride. The bike’s lightweight design, combined with its fuel-efficient performance of approximately 69.18 mpg, makes it both a practical choice for long journeys and a fun companion for weekend rides. Riders will appreciate the R12's stability and predictability on the road, thanks to its telescopic front fork and rigid rear suspension, which together provide a comfortable ride despite the motorcycle's vintage lineage. The R12 is not just about performance; it also boasts several notable features that enhance the riding experience. Its steel-pressed-loop frame provides durability while maintaining an aesthetic appeal that stands the test of time. The expanding drum brakes, measuring 200 mm in diameter at both the front and rear, offer reliable stopping power for a bike of its era. Additionally, the kickstarter adds an authentic touch, embodying the spirit of classic motorcycling, while the 14-litre fuel tank ensures that riders can embark on longer journeys without frequent refueling. The careful attention to detail and engineering excellence make the R12 a sought-after piece of history. **

Pros

  • Classic Aesthetics: The timeless design and iconic boxer engine appeal to vintage motorcycle enthusiasts.
  • Fuel Efficiency: With a consumption rate of 3.40 litres/100 km, the R12 is perfect for long-distance touring.
  • Solid Performance: The balance of power and stability makes for a reliable and enjoyable riding experience.

Cons

  • Limited Speed: While 110 km/h is respectable for its time, modern bikes easily surpass this, limiting its performance on highways.
  • Basic Suspension: The rigid rear suspension may not offer the comfort of more advanced systems found in contemporary motorcycles.
  • Kickstarter Only: The absence of an electric start might deter some riders accustomed to modern conveniences.

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. CK 25mm
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)