AJS Model 20 500: review, history, specs
AJS Model 20 | |
Manufacturer | |
---|---|
Also called | Model 20 500, Model 20 500 |
Production | 1948 - 1959 |
Class | Classic |
Successor | AJS Model 31 |
Engine | 498cc air-cooled twin, four-stroke |
Bore / Stroke | 66.0mm x 72.8mm |
Compression ratio | 7.3:1 |
Top Speed | 85 mph (137 km/h) |
Horsepower | 19.58 HP (14.6 KW) @ 6800RPM |
Ignition | magneto |
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 |
Length | 86.22 inches (2190 mm) |
Width | 27.95 inches (710 mm) |
Height | 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 |
The AJS Model 20 500 is a twin, four-stroke allround motorcycle produced 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. The Model 20 was finally discontinued when the 646 cc AJS Model 31 replaced it in the autumn of 1958.
Variants[edit | edit source]
The Model 20B was the model imported into the USA.
Engine[edit | edit source]
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[edit | edit source]
The bike has a 4-speed transmission. The final drive was via chain. Power was moderated via the wet multi-plate.
Chassis[edit | edit source]
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).
1948 - 1961 AJS Model 20 500[edit | edit source]
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.