This manual covers the TZ125 and TZ125G1 models produced between 1990 and 2005. The TZ series represents a commitment to performance and racing, building on a rich heritage in motorsports. These motorcycles are designed for competition, emphasizing lightweight construction, potent two-stroke power, and agile handling. The TZ125G1, in particular, served as an entry in the highly competitive 125cc racing class, embodying dedication to engineering excellence and reliability in demanding environments. This comprehensive workshop service repair manual provides essential information for maintaining and repairing your TZ125. It details engine mechanical and electrical systems, fuel and transmission systems, drivetrain, suspension, steering, brakes, and bodywork. You will find step-by-step repair procedures, diagnostic flowcharts, troubleshooting guides, and detailed technical specifications, including torque values and clearances. The manual also includes extensive illustrations, diagrams, and wiring schematics, making it an invaluable resource for both DIY enthusiasts and professional mechanics seeking to keep their TZ125 in optimal condition.