This workshop service repair manual provides comprehensive coverage for AJS and Matchless motorcycles, encompassing a wide range of lightweight models produced between 1958 and 1964, and heavyweight models from 1957 to 1966. These motorcycles represent a significant era in British motorcycle development. The manual details various engine displacements, including 250 c.c., 350 c.c., 500 c.c., and 600 c.c., and covers all model, engine, trim, and transmission types within the specified production periods. It is designed to assist owners, mechanics, restorers, and enthusiasts in maintaining and repairing these classic machines. This extensive manual offers factory-level repair information, enabling users to perform diagnostics, maintenance, and repairs efficiently. It covers all major systems, including engine design, lubrication, transmission, clutch, suspension, frame, wheels, brakes, and electrical components such as magneto, and dynamo. Detailed procedures for periodic maintenance, tune-ups, and troubleshooting are provided, along with step-by-step repair instructions for disassembly, assembly, and reinstallation. The manual's professional-level detail, including hundreds of pages of diagrams, illustrations, photos, critical specifications, and warnings, makes it an invaluable resource for anyone working on AJS and Matchless motorcycles.