The Gilera Runner ST125 and ST200 represent a lineage of performance scooters, known for their sporty, aggressive styling and capable performance, bridging the gap between traditional scooters and motorcycles. These models, prominent in the late 2000s and 2010s, were designed for commuters and enthusiasts seeking dynamic riding experiences. Key features include powerful liquid-cooled, 4-valve engines, automatic CVT transmissions, and robust chassis construction, all contributing to their reputation for agility and responsiveness. The ST designation signifies a modern, refined iteration of the classic Gilera Runner platform, built with engineering quality intended for reliability and engaging performance. This comprehensive English-language service and workshop manual provides detailed guidance for the Gilera Runner ST125 and ST200, covering essential areas such as mechanical systems, routine maintenance, and repair procedures. It is structured to assist both professional mechanics and DIY owners in understanding and maintaining their scooters. Key topics include engine repair, transmission service, brake system maintenance, suspension adjustments, fuel system servicing, and chassis work. Additionally, the manual details critical torque specifications, identifies necessary special tools, and offers troubleshooting advice for common issues, enabling effective upkeep and repair.