The Yamaha T135, known by various model nicknames including Exciter 135, Sniper 135, Jupiter MX, and Crypton X, is a popular underbone motorcycle model introduced in 2005. This first-generation model is characterized by its liquid-cooled, 135 cc, 4-stroke SOHC 4-valve engine, delivering approximately 11-12 PS and featuring a rotary 4-speed transmission with an automatic clutch. Its design emphasizes sporty appeal and performance, making it a prominent competitor in its segment. Built with Yamaha's reputation for engineering quality and reliability, the T135 offers efficient performance suitable for daily commuting and spirited riding. This comprehensive service and repair manual is designed to assist owners and technicians in maintaining and repairing the Yamaha T135 models from 2005 to 2009. It covers a wide array of essential systems, including engine mechanicals, fuel, cooling, electrical, chassis components, and the transmission/drive system. The manual details routine maintenance procedures, troubleshooting common issues, component overhaul and rebuild processes, and necessary adjustments and calibrations. With its in-depth technical information and clear guidance, this manual serves as an indispensable resource for ensuring the longevity and optimal performance of the T135.