This manual covers the AJS 350 & 500cc motorcycles produced in 1949. These motorcycles are recognized for their robust engineering and performance characteristic of the post-war British motor industry. The 350cc models typically offered around 18-20 BHP, while the 500cc variants provided an estimated 22-26 BHP. Both were equipped with air-cooled, single-cylinder, four-stroke engines and featured manual transmissions with wet multi-plate clutches. These machines were well-regarded in their era for handling and durability, making them a significant part of motorcycling history. The comprehensive workshop repair and technical guide is designed to assist AJS motorcycle owners and independent workshops with the complete restoration and maintenance of their vehicles. It details engine overhaul, gearbox operation, carburetor tuning, electrical systems, front fork assembly, steering head, frame inspection, wheel and brake servicing, and control adjustments. The manual provides routine servicing procedures, step-by-step repair instructions, troubleshooting guidance, and essential technical specifications, all supported by high-quality illustrations and diagrams. This resource is intended to be accessible even to those with basic mechanical knowledge, enabling significant cost savings on repairs and maintenance.