This manual covers the SMC Stinger ATV, model code STG 250. Designed for versatile off-road performance, the Stinger features a robust steel tube frame, independent dual A-arm front suspension, and a swingarm rear suspension for optimal handling. Its liquid-cooled, 250cc, single-cylinder, 4-stroke engine, equipped with a carburetor and CDI ignition, delivers reliable power, supported by an automatic transmission and available 2WD/4WD drive systems depending on the specific variant. The ATV is further equipped with disc brakes on both the front and rear, halogen headlights, and an LED taillight, making it a capable machine for various recreational and utility applications. This comprehensive Service Repair Workshop Manual provides in-depth information for all SMC Stinger STG 250 models. It details essential maintenance procedures, including general servicing and lubrication requirements, alongside in-depth troubleshooting guidance for fault finding. The manual also includes technical specifications covering the engine, transmission, cooling, fuel, ignition, electrical systems, brakes, wheels, tires, steering, suspension, frame, and bodywork, as well as wiring diagrams. This resource is an indispensable tool for owners, mechanics, and technicians seeking to maintain, repair, and optimize the performance and longevity of their SMC Stinger ATV.