BMW R12 Twin carb 1939 - Specifications & Review

Introducing the 1939 BMW R12 Twin Carb

The 1939 BMW R12 Twin Carb stands as a timeless emblem of innovation and performance in the annals of motorcycle history. Positioned in the sport category, this motorcycle was BMW's answer to the evolving demands of performance-driven riders in the late 1930s. With its distinctive two-cylinder boxer engine and a design that elegantly combines form and function, the R12 remains a sought-after classic among enthusiasts and collectors alike. Its unique aesthetic, complete with the iconic BMW roundel and a robust steel double cradle frame, makes it not only a reliable riding machine but also a stunning piece of engineering art that captures the spirit of its era.

Engine Performance and Riding Characteristics

At the heart of the R12 lies a 745cc two-cylinder boxer engine that produces a respectable 19.99 horsepower at 4000 RPM, offering a peak top speed of 120 km/h (74.6 mph). This engine configuration is not only visually striking but also enhances the motorcycle’s low center of gravity, resulting in nimble handling and a responsive riding experience. The 4-speed gearbox, coupled with a dry multiplate clutch, ensures smooth gear transitions, allowing riders to harness the bike’s power efficiently. The air-cooled design and a compression ratio of 5.2:1 contribute to a reliable performance, making the R12 a commendable performer on both city streets and winding country roads.

Key Features and Technology

The 1939 BMW R12 is packed with features that elevate its riding experience. Its fuel system employs a dual Amal carburettor setup, optimizing fuel delivery for performance and efficiency. The motorcycle is equipped with a rigid rear suspension and cartridge front suspension, providing a balance between comfort and handling precision. The braking system, featuring expanding drum brakes at both the front and rear, ensures adequate stopping power, though riders will note the vintage charm of its design. With a fuel capacity of 14 liters (3.70 gallons), the R12 allows for extended journeys without frequent stops, making it a practical choice for sport riding enthusiasts of its time.

Pros and Cons

Pros:

1. Iconic Design: The classic aesthetics and robust build of the R12 make it a standout model that appeals to vintage motorcycle collectors.
2. Smooth Handling: The low center of gravity provided by the boxer engine contributes to excellent handling characteristics, ideal for both city riding and spirited country excursions.
3. Reliable Performance: With a well-tuned engine and a sturdy frame, the R12 delivers a dependable ride that stands the test of time.

Cons:

1. Limited Power: While 19.99 HP is respectable for its time, modern motorcycles offer significantly more power, which may be a consideration for performance-focused riders.
2. Vintage Braking System: The drum brakes, though adequate for the era, may not provide the same stopping power and feel as contemporary disc brakes.
3. Kick Start Only: The lack of an electric starter may deter some riders, especially those accustomed to the convenience of modern starting systems.

The 1939 BMW R12 Twin Carb is not just a motorcycle; it's a piece of history that embodies the spirit of adventure and the thrill of riding in a bygone era. For enthusiasts, it offers a unique blend of style, performance, and nostalgia that continues to resonate with riders today.