BMW R51 1940 - Specifications & Review

The Timeless Charm of the 1940 BMW R51

In the annals of motorcycle history, few machines capture the essence of post-war engineering and style as beautifully as the 1940 BMW R51. This allround motorcycle epitomizes the German maker's dedication to quality, performance, and innovative design. Positioned as a versatile option for both city commuting and long-distance touring, the R51 showcases BMW's prowess in crafting motorcycles that are not only functional but also imbued with a sense of timeless elegance. With its classic lines and robust construction, the R51 remains a sought-after gem for collectors and enthusiasts alike.

At the heart of the R51 lies a potent 494cc two-cylinder boxer engine, which represents a hallmark of BMW's engineering expertise. Producing 24.07 horsepower at a modest 5600 RPM, this four-stroke powerplant delivers a satisfying blend of power and efficiency. Riders can expect a top speed of 140 km/h (87 mph), making it a capable companion on both winding roads and open highways. The engine’s 6.7:1 compression ratio and balanced bore and stroke dimensions (68mm x 68mm) contribute to its smooth performance, while the Amal carburettor ensures precise fuel delivery. The four-speed gearbox, combined with a reliable shaft drive, offers seamless power transfer, enhancing the riding experience with added confidence and control.

The R51 is not just about power; it also incorporates advanced features for its time that enhance comfort and safety. The motorcycle is built on a sturdy steel single cradle frame that supports a sophisticated suspension system featuring cartridge front suspension and a twin-shock swingarm at the rear. The 200mm drum brakes at both ends provide reliable stopping power, while the 14-liter fuel tank allows for extended journeys without frequent refueling stops. Visually, the R51’s design is both functional and aesthetically pleasing, ensuring that it stands out on the road. With a weight of 182 kg (401.2 lbs), it strikes a balance between being lightweight for agility and robust for stability.

#### Pros and Cons of the 1940 BMW R51

Pros:

1. Iconic Design: The R51's classic styling and attention to detail make it a timeless collectible, appealing to enthusiasts and casual riders alike.
2. Smooth Engine Performance: The boxer engine provides a unique riding experience with excellent low-end torque and a satisfying power delivery.
3. Comfortable Ride: The combination of a well-engineered suspension system and a comfortable seating position makes it suitable for both short commutes and longer journeys.

Cons:

1. Limited Top Speed: While 87 mph is respectable, it may not satisfy those looking for high-speed performance or modern highway capabilities.
2. Drum Brakes: The use of drum brakes, while effective for the time, may not offer the stopping power and responsiveness that contemporary riders expect.
3. Kick Start Only: The traditional kick start may deter some modern riders who prefer the convenience of electric starting systems found in today's motorcycles.

In conclusion, the 1940 BMW R51 is a remarkable motorcycle that offers a unique blend of classic engineering, distinctive style, and competent performance. Whether you are a vintage bike enthusiast or simply appreciate the charm of historical craftsmanship, the R51 invites you to embrace the open road with confidence and flair.