When Triumph introduced the Speed Twin in 1938, every other English manufacturer knew they had to offer two-cylinder motors of their own. AJS was the last of the major Brit builders to join the party (that pesky World War got in the way) when they released the Model 20 (and its Matchless twin, the G9) ten years later. Designed by Phil Walker, AJS’ parallel twin differed from the competition in that it featured a third crankshaft main bearing as well as alloy heads on iron barrels. This example was restored approximately 10 years ago and it’s been used sparingly since.
Production of the Model 20 lasted until 1961, by which point it had already been succeeded by the Model 31. During that time there were several major updates – in 1951 the “jampot” rear suspension was introduced, and a year later a 4-speed Burman transmission was utilized. Connected to the Bruman was a 498cc twin good for 26 horsepower and a top speed of approximately 90 miles per hour. For more on the Model 20, check out this review from Trade Motorcycles.
This example was restored in the mid-2000s and since then it has been ridden just 700 miles per a NOS speedo. Per the seller, it looks and runs great and “everything has either been restored or replaced to exact original condition.” Find this AJS Model 20 for sale in Gulfport, Mississippi for $7,999 here at French and Sons Motorcycle.