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BMW R12 Twin carb
1940Sportbike

BMW R12 Twin carb

Key specifications

Engine
745 cc
Power
20 HP
Fuel type
petrol
Fuel capacity
3.7 L
Transmission
4-speed
Front brakes
Expanding brake (drum brake). Single
Rear brakes
Expanding brake (drum brake)

Overview

### The 1940 BMW R12 Twin Carb: A Timeless Classic The 1940 BMW R12 Twin Carb stands as a testament to the golden age of motorcycle engineering, embodying a blend of performance and style that continues to captivate enthusiasts today. As a sport category motorcycle, the R12 was designed to deliver an exhilarating riding experience, making it a favorite among riders seeking both speed and comfort. With its distinctive two-cylinder boxer engine and iconic design, the R12 has carved a niche for itself in the annals of motorcycle history, appealing not only to collectors but also to those who appreciate the craftsmanship of vintage machines. At the heart of the R12 is a robust 745cc air-cooled, four-stroke boxer engine that generates a respectable 19.99 horsepower at 4,000 RPM. This powerplant, paired with a four-speed gearbox, delivers a top speed of 120 km/h (74.6 mph), making it a formidable contender on the roads of its time. Riders will appreciate the linear power delivery and the distinctive thrum of the boxer engine, which provides a unique character that sets the R12 apart from its contemporaries. The engine’s simple yet effective design, combined with a dry multiplate clutch, ensures a smooth and engaging ride, whether navigating city streets or cruising along winding country roads. The 1940 BMW R12 Twin Carb showcases an array of features that highlight BMW's commitment to innovation and quality. Its steel double-cradle frame and rigid rear suspension contribute to a solid ride, while the cartridge front suspension enhances handling and comfort. The drum brakes, both front and rear, are designed to provide reliable stopping power, although modern riders may find them less responsive compared to contemporary disc systems. With a fuel capacity of 14 liters, this classic bike is also well-equipped for longer journeys, allowing riders to embrace the open road with fewer stops. The nostalgia-inducing kick starter adds an authentic touch to the experience, reminding riders of simpler times when every ride required a bit of effort and engagement. - Classic Design: The R12's timeless aesthetics are a head-turner and a symbol of vintage motorcycle culture. - Engaging Riding Experience: The boxer engine provides a unique auditory and tactile experience, enhancing the joy of riding. - Strong Community: The R12 is well-regarded among collectors and vintage motorcycle enthusiasts, offering ample opportunities for camaraderie and support. - Limited Braking Performance: While sufficient for its time, the drum brakes may feel inadequate to modern riders accustomed to disc brakes. - Weight: At 185 kg (407.9 pounds), the R12 may be considered heavy compared to more contemporary motorcycles, which can affect maneuverability. - Kick Start Only: The absence of an electric starter may deter some riders, especially those seeking convenience and ease of use in modern machines. In summary, the 1940 BMW R12 Twin Carb is not just a motorcycle; it's a piece of history that continues to resonate with those who value both engineering excellence and the spirit of adventure. Whether you're a seasoned collector or a newcomer to the world of vintage rides, the R12 promises an experience that is both nostalgic and exhilarating.

Technical details

Source specification data

Make
BMW
Model
R12 Twin carb
Category
Sport
Starter
Kick
Carrying Capacity
300
Power
19.99 HP (14.6 kW)) @ 4000 RPM
Clutch
Dry multiplate-cable operated
Gearbox
4-speed
Top Speed
120.0 km/h (74.6 mph)
Fuel System
Carburettor. Amal
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)
Cooling System
Air
Engine Details
Two cylinder boxer, four-stroke
Lubrication System
Wet sump
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)
Weight Incl Oil Gas Etc
185.0 kg (407.9 pounds)
Seat
Spring-mounted seat
Wheels
Spoked
Rear Tyre
3.5-19
Frame Type
Steel-doble cradle
Front Tyre
3.50-19
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake). Single
Rear Suspension
Rigid-
Front Suspension
Cartrige
Front Brakes Diameter
200 mm (7.9 inches)