This manual provides comprehensive service and repair information for the GT Series, encompassing the GT125 and GT250 models. These motorcycles, produced around the 2002 era and for several years thereafter, are recognized for their sporty, aggressive styling, offering a good balance of performance suitable for urban commuting and spirited riding. As an affordable alternative in the entry-level to mid-range sportbike and naked bike segments, the GT Series features liquid-cooled, four-stroke V-twin engines with displacements of 124.5 cc and 249 cc respectively. Their engineering emphasizes value, with a robust steel frame, telescopic front fork, and reliable braking systems, making them popular choices for new riders and budget-conscious enthusiasts.

The purpose of this Service Repair Manual is to guide owners, mechanics, and technicians through the maintenance, troubleshooting, and repair of the GT Series. It covers essential areas including engine disassembly and assembly, lubrication, cooling, fuel, ignition, and exhaust systems, as well as transmission, drivetrain, chassis, suspension, braking, and electrical systems. Detailed procedures for routine maintenance, major repairs, and diagnostics are included, along with specifications for all critical components. This English language, text-searchable digital document, estimated to be between 300-500 pages, provides the necessary technical depth and clarity, including wiring diagrams and special tool identification, to ensure the vehicle remains in optimal operating condition.