The Yamaha SZR660 is a motorcycle model from 1998, recognized for its lightweight, agile, and track-focused performance within its displacement class. Built upon Yamaha's legacy of innovation and engineering prowess, the SZR660 features a liquid-cooled, single-cylinder, 4-stroke engine, typically around 660cc, delivering an estimated 50-60 horsepower. Its design philosophy emphasizes nimble handling, further enhanced by a steel perimeter frame, telescopic front forks, and a linkage-assisted monoshock rear suspension. The braking system utilizes dual front discs and a single rear disc for effective stopping power, contributing to its safety and performance capabilities. This digital factory service repair manual provides comprehensive guidance for the maintenance and repair of the Yamaha SZR660. It covers a wide array of systems, including general information, technical specifications, periodic inspections and adjustments, engine overhaul, cooling system, carburetor, chassis, and electricals, along with troubleshooting procedures. The manual is designed to empower owners and technicians by offering detailed information on engine rebuilds, carburetor tuning, chassis component replacement, and systematic diagnostic approaches for common and complex issues, ensuring the longevity and optimal performance of the vehicle.