This manual covers the Yamaha SX Viper 700 Series snowmobiles produced between 2002 and 2006, including the SX Viper ER, SX Viper Mountain, and SX Viper S variants. Yamaha has a long-standing reputation for producing reliable and high-performing snowmobiles, and the Viper series exemplifies this heritage, offering a powerful 698 cc, 2-stroke, 3-cylinder engine known for its performance on the trails. These machines are engineered for rider comfort and control, featuring robust chassis and suspension systems designed for varied snow conditions. The inherent quality and engineering of Yamaha snowmobiles ensure a dependable and enjoyable riding experience for enthusiasts. This comprehensive service manual provides detailed information for the maintenance, repair, and troubleshooting of your Yamaha SX Viper 700 Series snowmobile. It covers all major systems, including the engine, fuel system, cooling system, drivetrain, chassis, and electrical systems, offering step-by-step procedures, diagnostic flowcharts, and precise technical specifications. With hundreds of illustrations, exploded views, and diagrams, this manual empowers owners and technicians to perform dealership-level service, ensuring optimal performance, longevity, and safety. The manual is presented in English and is designed for easy navigation and use, enabling efficient and accurate work on the snowmobile.