The 65SX, a prominent model in the competitive junior motocross segment, represents a significant offering from a brand renowned for its high-performance off-road motorcycles. This first-generation model, produced between 1998 and 2003, is engineered with a two-stroke, single-cylinder engine, liquid-cooled for optimal performance and reliability. Its robust construction and focus on agility make it a favored choice for young riders developing their skills in motocross disciplines. The 65SX embodies a dedication to quality and racing heritage, providing a solid foundation for aspiring champions. This comprehensive Service Repair Workshop Manual provides essential guidance for the 65SX models from 1998 to 2003. It covers a wide array of critical systems, including detailed information on engine identification, the fuel system, cooling system, and electrical components such as the alternator and regulator. The manual offers step-by-step repair instructions, maintenance checklists, servicing specifications, and troubleshooting guides, enabling owners, mechanics, and technicians to effectively maintain, diagnose, and repair the vehicle. Its depth of coverage ensures that users can perform tasks ranging from routine servicing to complex repairs, mirroring dealership-level expertise.