The Yamaha T135, also known by various regional names such as LC135, Exciter 135, Sniper 135, Jupiter MX, Crypton X, and Spark 135, is a highly popular underbone motorcycle that revolutionized its segment. First introduced in 2005, this model is celebrated for its practicality, fuel efficiency, and sporty performance, embodying Yamaha's strong heritage in motorsport engineering. The First Generation T135 is equipped with a liquid-cooled, 4-stroke, SOHC, 4-valve engine, typically displacing around 135cc and producing approximately 11-12 horsepower. Its design features an underbone frame, a semi-automatic transmission with a 4-speed gearbox, and a chain final drive, making it a versatile choice for daily commuting and spirited riding. This comprehensive service repair workshop manual provides detailed guidance for the Yamaha T135 models produced between 2005 and 2009. It covers all essential aspects of the vehicle, including in-depth engine overhauls, transmission maintenance, chassis and suspension servicing, brake system repairs, and electrical system diagnostics. The manual also details scheduled maintenance procedures, troubleshooting common issues, and component rebuilds, offering step-by-step instructions with highly detailed, printable diagrams. This resource is designed to empower owners and technicians to maintain, repair, and understand their T135, ensuring optimal performance and longevity.