This Harley Davidson 1940-1947 Knucklehead Service Repair Manual is a comprehensive guide for anyone interested in the technical details of these classic motorcycles. It offers a wealth of information directly from the manufacturer, providing complete insights into the design and operation of these machines. The manual covers a wide range of topics, including: * **Mechanical and Technical Specifications**: Detailed information on the vehicle's engine, chassis, and other key components. * **Introductory Mechanics**: A foundation in basic mechanical concepts, essential for understanding the workings of the motorcycle. * **Equipment Elevation**: Guidance on lifting and positioning the motorcycle for maintenance and repair. * **Collisions**: Information on inspecting and repairing damage resulting from accidents. * **Products and Supplies**: Recommendations on the best tools, materials, and consumables for working on your Knucklehead. * **Painting**: Instructions on proper paint preparation, application, and maintenance techniques. * **Description of Various Parts**: A detailed breakdown of each component of the motorcycle, including their function and assembly. This manual provides the knowledge necessary for both maintenance and repairs, allowing you to keep your Harley Davidson Knucklehead running smoothly and reliably. With its comprehensive coverage and clear explanations, this manual is an invaluable resource for any owner or enthusiast.

The Harley-Davidson Knucklehead, produced from 1936 to 1947, stands as a pivotal chapter in motorcycle history, known for its groundbreaking engine design and lasting impact on the brand's legacy. Its name, derived from the characteristic exposed, "knuckle-like" rocker arm covers on the engine, hints at the innovative technology it housed. The Knucklehead's 45-cubic-inch (740 cc) V-twin engine featured a revolutionary overhead valve design, a departure from the previous side-valve engines prevalent in the industry. This innovation resulted in increased power and efficiency, making the Knucklehead a formidable machine for its time. The engine's distinct "potato-shaped" cylinder heads also contributed to its unique look, becoming a defining feature of the Knucklehead's timeless style. Beyond its mechanical advancements, the Knucklehead's introduction coincided with a period of social and cultural shifts. The era of the 1930s and 40s saw the rise of motorcycle clubs and the developing "chopper" aesthetic, which the Knucklehead readily embraced. Its powerful performance and distinctive styling made it a favorite among riders seeking a blend of speed and individuality. Production of the Knucklehead was interrupted during World War II as Harley-Davidson prioritized manufacturing military motorcycles. However, the model's popularity returned with renewed vigor upon its reintroduction after the war. The Knucklehead continued to evolve throughout its production run, with refinements to its engine, frame, and other components. From its initial release in 1936, the Knucklehead became synonymous with Harley-Davidson's commitment to innovation and performance. Its legacy endures in the design language of subsequent models and continues to inspire custom builders and enthusiasts alike. The Knucklehead remains a highly sought-after collectible, valued not only for its historical significance but also for its enduring presence as a symbol of Harley-Davidson's pioneering spirit and the enduring allure of classic motorcycles.