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AJS Model 20 500
1953Allround

AJS Model 20 500

Key specifications

Engine
498 cc
Power
20 HP
Weight
178 kg
Fuel type
petrol
Fuel capacity
3.6 L
Transmission
4-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1953 AJS Model 20 500: A Classic Allrounder The 1953 AJS Model 20 500 stands as a testament to British engineering during the golden age of motorcycling. Launched in the early 50s, this model perfectly embodies the spirit of adventure and practicality, making it a beloved choice among riders who sought a versatile motorcycle capable of both city commuting and rural exploration. With its classic styling and robust construction, the Model 20 500 is a charming piece of history that continues to captivate enthusiasts and collectors alike. Engine Performance and Riding Characteristics At the heart of the Model 20 500 lies a spirited 498cc twin-cylinder, four-stroke engine that delivers a respectable 20 horsepower at 6,800 RPM. This powerplant strikes a fine balance between performance and reliability, allowing the bike to achieve a top speed of 137 km/h (85 mph)—a remarkable feat for its era. The engine’s compression ratio of 7.0:1, combined with a traditional carburettor and magneto ignition, ensures smooth operation and a responsive throttle. Riders will appreciate the seamless shifting provided by the four-speed gearbox, while the wet multiplate clutch offers smooth engagement, making it an absolute pleasure to ride. The Model 20 500’s lightweight chassis (weighing in at just 178 kg/392.4 lbs) enhances its agility, allowing for nimble handling in both urban environments and winding country roads. Key Features and Technology The AJS Model 20 500 is not just a pretty face; it’s equipped with several features that enhance the riding experience. The single cradle frame provides a strong and stable foundation, while the telescopic front suspension and twin shock rear suspension work in harmony to absorb bumps and improve comfort. The expanding drum brakes at both ends deliver reliable stopping power, ensuring safety in various riding conditions. With a fuel capacity of 13.5 liters (3.57 gallons), the motorcycle is designed for longer journeys, allowing riders to explore with fewer interruptions. Classic enthusiasts will appreciate the kick starter, a nod to the traditional motorcycles of the past, which adds an element of nostalgia to the riding experience. **

Pros

    Cons

    • Timeless Design: The vintage aesthetic of the AJS Model 20 500 is sure to turn heads and spark nostalgia among fellow riders and enthusiasts.
    • Reliable Performance: With a robust engine and simple mechanics, the Model 20 is known for its reliability, making it a great choice for both new and experienced riders.
    • Agility and Comfort: The lightweight design and effective suspension provide an enjoyable ride, whether navigating city streets or cruising along scenic routes.
    • Limited Power: While the 20 HP is sufficient for leisurely rides, it may not satisfy those seeking high-performance thrills.
    • Drum Brakes: The expanding drum brakes, while reliable for their time, may not offer the stopping power or responsiveness of modern disc brakes.
    • Kick Start Only: In an age of electric starts, the kick starter can be a challenge for some riders, especially those not familiar with the technique.

    Technical details

    Source specification data

    Make
    AJS
    Model
    Model 20 500
    Category
    Allround
    Starter
    Kick
    Power
    20.00 HP (14.6 kW)) @ 6800 RPM
    Clutch
    Wet multiplate
    Gearbox
    4-speed
    Ignition
    Magneto
    Top Speed
    137.0 km/h (85.1 mph)
    Fuel System
    Carburettor
    Bore X Stroke
    66.0 x 72.8 mm (2.6 x 2.9 inches)
    Compression
    7.0:1
    Displacement
    498.00 ccm (30.39 cubic inches)
    Cooling System
    Air
    Engine Details
    Twin, four-stroke
    Transmission Type Final Drive
    Chain
    Dry Weight
    178.0 kg (392.4 pounds)
    Fuel Capacity
    13.50 litres (3.57 gallons)
    Overall Width
    710 mm (28.0 inches)
    Overall Height
    1,050 mm (41.3 inches)
    Overall Length
    2,190 mm (86.2 inches)
    Power Weight Ratio
    0.1124 HP/kg
    Seat
    Dual
    Wheels
    Spoked
    Rear Tyre
    3.25-19
    Frame Type
    Single cradle
    Front Tyre
    3.25-19
    Rear Brakes
    Expanding brake (drum brake)
    Front Brakes
    Expanding brake (drum brake)
    Rear Suspension
    Twin shock
    Front Suspension
    Telescopic