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AJS Model 20 500
1956Allround

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 1956 AJS Model 20 500—a classic motorcycle that embodies the spirit of mid-20th century British engineering. Designed for the discerning rider, this all-rounder combines style, comfort, and reliable performance, making it a popular choice among enthusiasts seeking a vintage experience. With its rich heritage and timeless aesthetics, the Model 20 500 stands out not only for its historical significance but also for its ability to deliver an engaging ride, whether you're cruising through town or embarking on longer journeys. At the heart of the AJS Model 20 500 is its robust 498cc twin-cylinder engine, delivering a respectable 20 HP at 6800 RPM. This four-stroke powerhouse, with a compression ratio of 7.0:1, offers a delightful balance of power and efficiency. Riders can expect a top speed of approximately 137 km/h (85.1 mph), making it a competent performer on the road. The air-cooled engine is paired with a smooth 4-speed gearbox, allowing for seamless gear changes and a satisfying riding experience. With its chain final drive and wet multiplate clutch, the Model 20 500 provides a reliable and predictable ride, instilling confidence whether navigating city streets or tackling winding country roads. The AJS Model 20 500 features a single cradle frame that promotes stability and comfort, while the telescopic front suspension and twin shock rear suspension ensure a smooth ride over varied terrains. The expanding drum brakes front and rear provide sufficient stopping power, embodying the simplicity and effectiveness of classic motorcycle design. With a weight of 178 kg (392.4 pounds) and a fuel capacity of 13.5 liters (3.57 gallons), this model strikes an appealing balance between agility and endurance, making it a practical choice for both short jaunts and longer excursions. The kick starter adds an element of nostalgia, reminding riders of the hands-on approach that defines this era of motorcycling. In summary, the 1956 AJS Model 20 500 is not just a motorcycle; it’s a piece of history, offering a unique blend of nostalgia and performance that continues to captivate motorcycle enthusiasts to this day.

Pros

  • Classic Design: The vintage aesthetics and craftsmanship make the AJS Model 20 500 a head-turner at any gathering.
  • Reliable Performance: The well-engineered engine and gearbox provide a dependable riding experience, perfect for both new and seasoned riders.
  • Comfortable Ride: The combination of a stable frame and effective suspension contributes to a smooth and enjoyable ride, ideal for longer journeys.

Cons

  • Limited Power: While adequate for leisurely rides, the 20 HP engine may feel underwhelming for those seeking high-speed thrills.
  • Drum Brakes: The expanding drum brakes, while reliable for their time, may not provide the stopping power expected by modern standards.
  • Kick Start Only: The absence of an electric start can be a drawback for some riders, especially in less-than-ideal conditions.

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)
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