This manual covers the Triumph 350/500 Series motorcycles produced in 1966. These classic British parallel-twin roadsters, manufactured in Meriden, England, are renowned for their robust engineering, accessible performance, and iconic styling. Evolving from earlier designs, the 1966 models, particularly the 500cc variants like the T100, featured unit construction engines, a significant technological advancement for their time. The 350cc and 500cc models, with displacements of approximately 343cc and 490cc respectively, offered riders a blend of reliable performance and a distinctive riding experience, making them highly regarded by enthusiasts and a staple in the mid-weight roadster segment of their era.

This comprehensive service and repair manual provides essential information for the maintenance, rebuilding, refurbishing, and restoration of your Triumph 350/500 Series motorcycle. It details procedures for the engine, transmission, frame, suspension, brakes, electrical system, and fuel system, including specific guidance on overhaul, tuning, lubrication, and component replacement. The manual also offers troubleshooting charts for common issues and outlines necessary maintenance intervals and fluid specifications. This resource is invaluable for owners, mechanics, and restoration specialists seeking to preserve and maintain these iconic British motorcycles.