The Harley Davidson Knucklehead 1940-1947 WSM Service Repair Manual is your comprehensive guide to maintaining and repairing your classic motorcycle. This in-depth manual covers all aspects of your Knucklehead, from routine maintenance to complex repairs. With detailed step-by-step instructions, clear illustrations, and wiring diagrams, you'll be equipped to handle any job with confidence.

Discover how to perform a wide range of services, including engine rebuilds, transmission overhauls, electrical system troubleshooting, and much more. The manual provides valuable insights into the inner workings of your Knucklehead, empowering you to become a skilled and knowledgeable mechanic. No longer will you need to rely on others to keep your classic motorcycle running smoothly, you'll have the knowledge and resources to tackle any challenge. The manual is a valuable asset for any Knucklehead enthusiast, making ownership more rewarding and cost-effective.

The Harley-Davidson Knucklehead, produced from 1936 to 1947, marked a significant leap forward in motorcycle engineering. This iconic model, recognized by its distinctive "knuckle" shaped rocker boxes, introduced a revolutionary overhead valve (OHV) design to Harley-Davidson's lineup. Previously, Harley-Davidson motorcycles employed the less efficient flathead engine design. The Knucklehead's OHV configuration, combined with a larger displacement engine (74 cubic inches, later increased to 80 cubic inches) and a more robust transmission, delivered dramatically improved performance, power, and reliability. The Knucklehead quickly became a popular choice for both touring and racing applications, establishing itself as a high-performance machine in its era.

The 1940-1947 Knucklehead, specifically targeted by the WSM Service Repair Manual, represents the final years of this iconic motorcycle. These later models incorporated several refinements, including a new oil pump design and improvements to the camshaft and valvetrain. While still sharing the characteristic features of earlier Knuckleheads, these bikes boasted enhanced durability and serviceability. The WSM Service Repair Manual provided a comprehensive guide for mechanics and owners alike, detailing the complexities of the Knucklehead's design and offering step-by-step instructions for maintenance, repairs, and troubleshooting. Its publication was crucial in ensuring the longevity and continued popularity of these classic motorcycles, allowing them to remain cherished by enthusiasts for generations.