and reliability for Harley-Davidson. Key to the Knucklehead's success was the 61 cubic inch (1000 cc) V-twin engine. It used overhead valves (OHV) which resulted in better airflow and was capable ...

Harley-Davidson was founded in Milwaukee ... In 1915, Harley introduced the 11-F, a three-speed sliding gear transmission, 61 cubic inch F-head V-twin engine-powered touring machine that pushed ...