AJS Model 20 500 1951 - Specifications & Review

The 1951 AJS Model 20 500 stands as a classic testament to mid-century British motorcycle engineering, perfectly catering to the allround category. With its robust design and versatile capabilities, this motorcycle was crafted for riders who desired both performance and practicality. The Model 20 emerged from the AJS lineup as a reliable choice for commuting, leisure riding, and even light touring, showcasing a blend of elegance and function that resonates with enthusiasts today. As one of AJS's flagship models during this era, it encapsulates the spirit of post-war motorcycling, offering a glimpse into the engineering prowess of the time.

At the heart of the AJS Model 20 is a spirited 498cc twin-cylinder, four-stroke engine that delivers a respectable 20 horsepower at 6,800 RPM. This power allows the motorcycle to reach a top speed of 137 km/h (85.1 mph), making it a capable performer on both city streets and country roads. The engine’s 7.0:1 compression ratio paired with a carburettor and magneto ignition ensures dependable starting and smooth power delivery, while the four-speed gearbox allows for seamless gear changes, enhancing the overall riding experience. With a weight of 178 kg (392.4 pounds), the Model 20 strikes a balance between power and agility, providing riders with the confidence to navigate various terrains.

Notably, the AJS Model 20 is equipped with a single cradle frame, providing strength and stability, complemented by telescopic front suspension and twin shock rear suspension for a comfortable ride. Its expanding drum brakes, both front and rear, offer reliable stopping power—essential for the more spirited rides. The classic design is accentuated with a fuel capacity of 13.5 liters (3.57 gallons), allowing for longer journeys without frequent stops. The traditional kick starter not only pays homage to the era but also ensures that riders connect directly with the machine, fostering a genuine bond that modern electric starters often lack.

Pros:

1. Versatile Performance: The Model 20's configuration makes it suitable for various riding styles, from commuting to leisurely weekend rides.
2. Classic Aesthetics: The vintage design and engineering attract motorcycle enthusiasts looking for a piece of history.
3. Dependable Engineering: With a reputation for reliability, AJS motorcycles are known for their durability and longevity.

Cons:

1. Limited Speed: While capable, the top speed may feel modest compared to modern motorcycles, potentially limiting its appeal to speed enthusiasts.
2. Drum Brakes: The use of drum brakes may not provide the same stopping power and responsiveness as contemporary disc brakes.
3. Kick Start Only: The traditional kick starter can be cumbersome, especially for new riders accustomed to electric starters.

In summary, the 1951 AJS Model 20 500 is not just a motorcycle; it’s a piece of history that embodies the spirit of the era while delivering a unique riding experience that continues to captivate enthusiasts around the world.