AJS Model 20
| Manufacturer | Associated Motorcycles Plumstead, London |
|---|---|
| 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 20500 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.
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 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 is fitted with a 3.57 Gallon (13.50 Liters) fuel tank. The bike weighs just 392.42 pounds (178.0 Kg).