AJS Model 20: review, history, specs
Manufacturer | Associated Motorcycles Plumstead, London |
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Production | 1948–1958 |
Successor | AJS Model 31 |
Engine | 498 cc air cooled twin |
Top speed | 85 mph |
Transmission | Four speed gearbox to chain final drive |
Suspension | teledraulic forks, swinging arm rear |
Brakes | drum brakes |
Weight | 395 lb |
Manuals | Service Manual |
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The AJS Model 20 500 is a twin, four-stroke allround motorcycle produced between 1949 and 1959. It could reach a top speed of 85 mph (137 km/h). Claimed horsepower was 19.58 HP (14.6 KW) @ 6800 RPM. The Model 20 was finally discontinued when the 646 cc AJS Model 31 replaced it in the autumn of 1958.
Variants
The Model 20B was the model imported into the USA.
Engine
The engine was a air cooled twin, four-stroke. A 66.0mm bore x 72.8mm stroke result in a displacement of just 498.0 cubic centimeters. The engine features a 7.0:1 compression ratio.
Drive
The bike has a 4-speed transmission. The final drive was via chain. Power was moderated via the wet multi-plate.
Chassis
It came with a 3.25-19 front tire and a 3.25-19 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a telescopic while the rear was equipped with a twin shock. The Model 20 500 is fitted with a 3.57 Gallon (13.50 Liters) fuel tank. The bike weighs just 392.42 pounds (178.0 Kg).
Manufacturer | AJS |
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Also called | Model 20500, Model 20 500 |
Production | 1948 - 1959 |
Class | Classic |
Engine | twin, four-stroke |
Bore / Stroke | 66.0mm x 72.8mm |
Compression ratio | 7.3:1 |
Top speed | 85 mph (137 km/h) |
Horse Power | 19.58 HP (14.6 KW) @ 6800RPM |
Ignition type | magneto |
Battery | 7.0:1 |
Transmission | Gear box: 4-speed Final Drive: chain |
Suspension | Front: telescopic Rear: twin shock |
Brakes | Front: expanding brake (drum brake) Rear: expanding brake (drum brake) |
Front Tire | 3.25-19 |
Rear Tire | 3.25-19 |
Dimensions | L 86.22 inches (2190 mm) W 27.95 inches (710 mm) H 41.34 inches (1050 mm) |
Weight | 392.42 pounds (178.0 Kg) (dry), 178.0 kg (wet) |
Fuel capacity | 3.57 Gallon (13.50 Liters) |
Manuals | Service Manual |
Tech Specs · Brochures · Reviews · Ads · Videos |
The AJS Model 20500 was a twin, four-stroke Classic motorcycle produced by AJS between 1948 and 1959. It could reach a top speed of 85 mph (137 km/h). Claimed horsepower was 19.58 HP (14.6 KW) @ 6800 RPM.
Engine
The engine was a air cooled twin, four-stroke. A 66.0mm bore x 72.8mm stroke result in a displacement of just 498.0 cubic centimeters.
Drive
The bike has a 4-speed transmission. Power was moderated via the wet multiplate.
Chassis
It came with a 3.25-19 front tire and a 3.25-19 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a telescopic while the rear was equiped with a twin shock. The Model 20500 was fitted with a 3.57 Gallon (13.50 Liters) fuel tank. The bike weighed just 392.42 pounds (178.0 Kg).
1948 - 1961 AJS Model 20 500
The 1948 AJS Model 20 500 has, at its heart, an air-cooled, four-stroke, 498cc, parallel twin cylinder powerplant mated to a four-speed manual transmission. It comes standard with features such as laced wheels, a suspension package composed of a front telescopic fork and dual rear shocks, a solo, sprung seat, wide handlebars, an analogue instrument cluster, a dual exhaust system, full-fenders, a blacked-out frame, and a large, 17-liter (4.5-gallon) fuel tank.