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BMW R12 Single Carb
1941Allround

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 1941 BMW R12 Single Carb, a stunning example of pre-war motorcycle engineering that perfectly embodies the spirit of its era. Positioned as an all-rounder, this classic bike was designed for versatility, providing riders with both comfort and performance. With its timeless aesthetic and robust build, the R12 has become a beloved icon among vintage motorcycle enthusiasts. It stands as a testament to BMW's engineering prowess, merging style with functionality during a time when motorcycles were rapidly evolving. At the heart of the R12 lies a formidable two-cylinder boxer engine, displacing 745 ccm and producing 18 horsepower at 3,400 RPM. This four-stroke powerhouse delivers a spirited ride, allowing the motorcycle to reach a top speed of 110 km/h (68.4 mph). With a compression ratio of 5.2:1 and a balanced bore and stroke of 78 mm, the R12 offers smooth power delivery and impressive fuel efficiency of 3.40 litres per 100 km (approximately 69.18 mpg). Riders can expect a thrilling experience on the open road, with the unmistakable thrum of the boxer engine providing an exhilarating soundtrack to their journey. The R12 is equipped with several key features that enhance its performance and rider experience. A steel-pressed-loop frame provides a sturdy yet lightweight structure, while the telescopic front fork and rigid rear suspension offer a balance of comfort and control. The bike's braking system, with 200 mm drum brakes at both the front and rear, ensures reliable stopping power that instills confidence in any rider. Moreover, the classic kick starter adds a touch of nostalgia, echoing the simplicity and mechanical charm of motorcycling's golden age. **

Pros

  • Timeless Design: The R12’s classic styling and distinctive boxer engine make it a head-turner at any motorcycle gathering.
  • Fuel Efficiency: With impressive mileage, this bike allows for longer rides without frequent stops for refueling.
  • Robust Engineering: BMW's engineering excellence ensures reliability and durability, making the R12 a dependable choice for vintage enthusiasts.

Cons

  • Limited Power: While charming, the 18 HP may feel underwhelming for riders accustomed to modern performance standards.
  • Basic Suspension: The rigid rear suspension can result in a less comfortable ride on rough terrain compared to contemporary bikes.
  • Kick Start Only: The absence of an electric starter can be a challenge for some riders, especially in urban settings or for those not accustomed to classic motorcycles.

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)