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: Originally 61 cubic inches (1,000cc); increased to 74 cubic inches (1,200cc) in 1941.
: Approximately 36–40 horsepower, a significant increase for its time. Transmission : Four-speed constant mesh transmission. KnuckleheadHD
Developed during the Great Depression and authorized for production in 1931, the Knucklehead was Harley-Davidson’s high-stakes gamble to outperform its rival, Indian Motorcycle. Despite early "teething troubles"—including oil leaks and brittle valve springs—it successfully established the template for the modern American V-twin. The Genius Engineering Of Harley-Davidson's Knucklehead : Originally 61 cubic inches (1,000cc); increased to
: Introduced a dry-sump system with a mechanical oil pump. 📜 Historical Significance : Originally 61 cubic inches (1