Motorcycle, Solo (Harley-Davidson Model WLA) is an official U.S. War Department technical manual originally published in 1943, providing comprehensive guidance on the operation, maintenance, and repair of the iconic Harley-Davidson Model WLA motorcycle. This detailed manual was designed for military personnel and mechanics, offering step-by-step instructions, diagrams, and technical specifications to ensure the reliable performance of the WLA under demanding wartime conditions. Covering every aspect of the motorcycle, from engine and transmission to electrical systems, lubrication, and troubleshooting, the book serves as an invaluable resource for both historical enthusiasts and restoration experts. It includes information on routine servicing, field repairs, and the proper use of tools and spare parts, reflecting the practical needs of soldiers in the field. The manual also features detailed illustrations and exploded views, making complex mechanical concepts accessible and understandable. As a historical document, Motorcycle, Solo (Harley-Davidson Model WLA) not only preserves the technical knowledge of a bygone era but also offers a fascinating glimpse into the role of motorcycles in military operations during World War II.