This manual covers Yamaha 2-Stroke Twins Street Motorcycles produced between 1965 and 1978, representing the Classic Twin-Cylinder Era. These iconic machines, known for their spirited performance and distinctive two-stroke sound, offered a compelling blend of engineering and reliability for riders of the period. Featuring a range of displacements from 250cc to 400cc, these motorcycles typically employed a carbureted fuel system, a manual transmission with five or six speeds, and a chain final drive. Their robust chassis, often a steel tubular or double cradle frame, was complemented by telescopic front forks and a swingarm with twin shock absorbers for a balanced ride. Braking systems varied, with front options including drum or disc, while the rear consistently featured a drum brake.

This comprehensive Service Repair Workshop Manual provides essential information for the maintenance, repair, and servicing of your Yamaha 2-Stroke Twins. It details all aspects of the vehicle, including engine specifications, transmission operation, chassis and suspension components, and electrical systems. Within these pages, you will find detailed procedures for routine maintenance, troubleshooting common issues, and in-depth technical specifications. This manual is an indispensable resource for owners, mechanics, and technicians seeking to preserve the performance and longevity of these classic motorcycles, ensuring they remain in optimal condition for years to come.