Documented by YouTube's "Backyard Barn Finds," this barn-kept collection includes about ten vintage Harley-Davidson bikes. And most of them hail from the 1930s and 1940s and sport Knucklehead engines.

Harley-Davidson wanted to provide its riders with an engine that was true to its touring roots, fostering a better, more ...

Imagine a Harley not roaring down a sunlit highway, but traversing the mud-soaked battlefields of World War II. This is the ...

So Harley-Davidson decided to take the risk with a new model and engine. That engine was the Knucklehead, the first Harley-Davidson with overhead valves, positive pressure lubrication, and both ...

It all started with the Knucklehead V-twin powerplant of a Harley-Davidson model from 1947, which is in fact the only piece of stock hardware used here.

Jax Teller's motorcycle in Sons of Anarchy is almost as iconic as the man himself. But what exactly did Jax ride in the series, and what were the specs?

Amherst motorcycle legend John Penton was deserving of the recognition when he celebrated his 100th birthday during the final ...