This manual covers the Comet GT125 and GT250 models, produced for the 2002 through 2010 model years. These motorcycles, originating from South Korea, feature a V-Twin engine configuration, with displacements of approximately 125cc and 250cc respectively, and are characterized by their naked sportbike or cruiser styling. While not known for extensive technological features like ABS or USB charging, the Comet series offers a straightforward riding experience, making them suitable for DIY enthusiasts and those seeking accessible maintenance. This workshop service repair manual provides comprehensive guidance for owners and technicians alike. The scope of this 199-page English-language manual is extensive, detailing all essential aspects of maintaining and repairing your Comet GT125/GT250. It includes step-by-step procedures for engine systems, fuel and ignition, transmission, braking, suspension, and electrical systems. You will find information on scheduled maintenance, troubleshooting common issues, component overhaul, and necessary adjustments, supported by detailed illustrations, exploded diagrams, and critical torque specifications. Emphasis is placed on safety through highlighted DANGER, CAUTION, and NOTE remarks, ensuring both vehicle longevity and user protection during all service operations.