Harley's inextricable link to the v-twin engine is not absolute, and variations exist early in its history. Demonstrating this is an engine made for the Harley-Davidson WF Sport, which was built ...

The 1909 Renault Gray Model 5-D was the first Harley-Davidson motorcycle to feature a V-twin engine. Harley-Davidson The V-twin did not truly begin its takeover of the two-wheeled world until around ...

Over time, V-twin engine varieties included some of the best Harley-Davidson engines ever made, such as the Flathead, Knucklehead, Panhead, Shovelhead, Evolution, Twin Cam, and Milwaukee-Eight.

The Harley Davidson Breakout is one of the company's more popular motorcycles, but just how much power does it have? Here's a ...