This manual covers the Runner Purejet 50, produced for the 2003-2004 model years. Known for its sporty design and dynamic performance, the Runner line, originating from the Italian brand, offers a blend of advanced features for its class. This particular model is equipped with a liquid-cooled, 49.3 cc single-cylinder, two-stroke engine featuring an electronic direct injection (Purejet) system, paired with an automatic continuously variable transmission (CVT) driving the rear wheel. The Runner Purejet 50 is designed for agile urban mobility and recreational riding, emphasizing a responsive and engaging experience. This comprehensive service repair workshop manual provides detailed instructions for the complete Runner Purejet 50, covering all aspects from front to back. It is meticulously structured with step-by-step procedures, supported by highly detailed exploded pictures and diagrams, making it an invaluable resource for owners, DIY enthusiasts, and professional mechanics. The manual delves into engine disassembly, assembly, tuning, diagnostics, and specific systems like fuel injection and cooling. It also details maintenance and repair for the transmission, brakes, electrical systems, chassis, suspension, and bodywork, along with troubleshooting and diagnostic guides for common and uncommon issues.