The Arctic Cat ZL 800 EFI ESR, produced for the 2003 model year, represents a significant offering in the snowmobile market. Known for its sporty handling and powerful engines, the ZL series, including this model, was engineered for performance. This particular snowmobile features a liquid-cooled, 2-stroke engine with a displacement of approximately 794cc, equipped with Electronic Fuel Injection (EFI) for optimal power delivery and efficiency. Its robust construction and advanced systems, such as the Continuously Variable Transmission (CVT) and likely an Arctic Cat ACT Diamond Drive, underscore its engineering quality and reliability, making it a capable machine for enthusiasts and demanding terrain. This comprehensive factory service repair manual provides essential information for the maintenance and repair of the 2003 Arctic Cat ZL 800 EFI ESR snowmobile. It covers a wide array of systems, including the engine, transmission, brakes, electrical system, suspension, steering, cooling, fuel injection, and chassis. The manual details general maintenance procedures, troubleshooting guides, lubrication schedules, wiring and circuit diagrams, technical data, and specific repair procedures. Designed for technicians, mechanics, and owners, this English-language manual offers complete factory service and repair guidance, ensuring the longevity and optimal performance of your snowmobile.