
AJS Model 20 500
Key specifications
Overview
### Introducing the 1952 AJS Model 20 500 The 1952 AJS Model 20 500 stands as an iconic representation of post-war British motorcycling, blending classic design with reliable performance. Positioned in the allround category, this motorcycle appeals to enthusiasts seeking a versatile ride capable of handling a variety of terrains and purposes. With its striking lines and distinctive styling, the Model 20 captures the essence of mid-century motorcycling, making it a cherished piece of history for collectors and riders alike. ### Engine Performance and Riding Characteristics Beneath the elegant exterior lies a robust 498 cc twin-cylinder, four-stroke engine that delivers a spirited 20 horsepower at 6,800 RPM. This power allows the Model 20 to reach a top speed of 137 km/h (85.1 mph), ensuring an exhilarating ride on both city streets and country roads. The engine's 7.0:1 compression ratio, combined with a carburettor fuel system and magneto ignition, provides a reliable and responsive throttle response, making it an enjoyable motorcycle to ride. The 4-speed gearbox, coupled with a chain final drive, delivers smooth shifts and optimal acceleration, while the wet multiplate clutch enhances control during various riding conditions. ### Key Features and Technology The AJS Model 20 500 is engineered with thoughtful features that cater to both comfort and performance. Its single cradle frame offers a sturdy foundation, while telescopic front suspension and twin shock rear suspension contribute to a smooth ride over uneven surfaces. The motorcycle is equipped with drum brakes at both the front and rear, providing reliable stopping power typical of its era. With a fuel capacity of 13.5 liters, riders can enjoy longer journeys without frequent stops, while its manageable weight of 178 kg ensures an agile riding experience. The kick starter adds a touch of classic charm, reminding riders of the traditional methods of firing up a beloved machine. ###
Pros
Cons
- Classic Aesthetic: The Model 20's vintage design and styling make it a head-turner and a great addition to any classic motorcycle collection.
- Balanced Performance: With a top speed of 137 km/h and adequate power output, it strikes a fine balance between performance and usability for various riding needs.
- Comfortable Ride: The combination of a well-designed frame and effective suspension makes for a comfortable ride on diverse terrains.
- Limited Power: While 20 HP is sufficient for casual riding, it may not satisfy those seeking high-performance thrills from their motorcycle.
- Drum Brakes: The drum brake system, while reliable, may lack the stopping power and responsiveness offered by modern disc brakes.
- Kick Start Only: The absence of an electric starter can be a hassle for some riders, especially in challenging conditions or during cold starts.
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