Related: Win a 1937 Harley Davidson Knucklehead With Wheels Through Time By the early 1930s, the limitations of the flathead, or side valve, cylinder head design were becoming increasingly apparent, ...

Harley-Davidson's Big Twin is the heart and soul of America's most famous touring bikes. As Cycle World put it: "If ever an engine inspired religious fervor, this is it." This fall the icon gets an ...

Harley-Davidson Inc. said Tuesday that it is rolling out a more powerful engine for the 2017 lineup of Touring motorcycles. Harley-Davidson Inc. said Tuesday that it is rolling out a more powerful ...

Harley-Davidson motorcycles have always been defined by their engines. Owners and loyalists know the names and nicknames for each successive powerplant version. A new engine represents the start of a ...