This manual covers 650cc parallel-twin motorcycles and Trident 750cc parallel-triple motorcycles, iconic British machines renowned for their distinctive engines and rich heritage. The 650cc parallel-twin, primarily produced from the early 1950s through the mid-1970s, powered legendary models like the Bonneville and Tiger, known for their performance and unique sound. The Trident, introduced in the late 1960s, represented an evolution with its 750cc three-cylinder configuration, offering enhanced smoothness and power. These motorcycles are celebrated for their significant contribution to motorcycle culture and sport, making them highly sought-after classics for enthusiasts and restorers.

This comprehensive service and repair manual provides detailed guidance for maintaining and repairing these classic models. It encompasses a wide range of crucial areas, including in-depth engine overhaul procedures for both parallel-twin and triple configurations, transmission dismantling and reassembly, clutch operation, gearbox integration, and primary and final drive systems. Additionally, the manual covers chassis and suspension maintenance, braking system service, and detailed electrical system troubleshooting, including wiring diagrams and component diagnostics. With its extensive coverage of maintenance procedures, repair processes, and troubleshooting guides, this manual is an essential resource for owners, mechanics, and technicians seeking to preserve the performance and longevity of their vintage motorcycles.