This workshop service repair manual provides comprehensive guidance for the GF125, a motorcycle recognized for its presence in the sportbike and naked bike segments. As a product of a South Korean manufacturer, the GF125 represents a capable option within the 125cc class. This manual details the engineering and specifications of this model, which typically features a liquid-cooled, single-cylinder engine, likely around 125cc displacement, producing approximately 13-15 horsepower. Its design and components are geared towards riders seeking an entry-level performance experience. This manual is designed to be an authoritative resource for owners, independent mechanics, and enthusiasts. It covers essential workshop service and repair procedures, including detailed instructions for engine systems, chassis components, and electrical diagnostics. Maintenance schedules, fluid specifications, and troubleshooting guides are thoroughly explained, ensuring owners can effectively care for their GF125. The comprehensive nature of this document, extending to detailed diagrams and wiring schematics, makes it an indispensable tool for maintaining the reliability and optimal performance of the GF125.