This workshop service manual provides comprehensive guidance for the Triumph T100 and T100s models produced between 1963 and 1974. These classic British motorcycles, powered by air-cooled, four-stroke parallel-twin engines ranging from 490cc to 500cc, are celebrated for their reliable performance and iconic styling. The T100 series represents a significant era in Triumph's twin-cylinder development, evolving from earlier designs to incorporate unit construction engines. This manual is an essential resource for owners and enthusiasts looking to maintain, repair, and restore these notable machines.

This manual covers a wide array of essential maintenance and repair procedures, including complete engine overhauls, tuning, carburetion, and lubrication system servicing. It details gearbox disassembly and assembly, clutch operation, primary drive, and chassis components such as suspension, steering, wheels, and brakes. Electrical systems, including wiring diagrams, lighting, and charging systems, are also thoroughly addressed. With 258 pages of detailed information, this English-language workshop service manual is designed to assist owners and technicians in keeping their Triumph T100/T100s in optimal condition, covering everything from routine servicing to complex component rebuilds.