The Vespa GTS 250 i.e. represents a significant evolution in the iconic Vespa lineage, blending timeless Italian design with modern engineering. Powered by a robust 244 cc single-cylinder, 4-stroke Quasar engine featuring electronic fuel injection, this model offers a dynamic riding experience suitable for both urban commuting and longer journeys. Its steel frame, combined with advanced suspension and braking systems, including optional ABS, underscores a commitment to rider safety and comfort. The Vespa GTS 250 i.e., produced primarily in the mid-2000s to early 2010s, is celebrated for its distinctive styling, practical features like under-seat storage, and reliable performance, making it a popular choice for discerning riders. This comprehensive Workshop Service Repair Manual provides in-depth guidance for all aspects of the Vespa GTS 250 i.e. and its Quasar 250 (M451M) engine. It covers everything from routine maintenance tasks such as oil changes and filter replacements to complex mechanical and electrical repairs, including detailed procedures for engine overhaul, transmission servicing, fuel injection systems, and chassis components. With extensive A-Z coverage, troubleshooting guides, and numerous detailed diagrams and pictures, this manual is an indispensable resource for Vespa GTS 250 i.e. owners and independent mechanics alike, enabling efficient and accurate maintenance and repair to ensure the vehicle's optimal performance and longevity.