This manual covers ATVs manufactured between 1996 and 2003, specifically the early models of the 400 and 500. These robust All-Terrain Vehicles are engineered for versatility and reliability, featuring a 4-stroke, liquid-cooled SOHC engine with either 375cc or 499cc displacement, a carburetor fuel system, and CDI ignition. The transmission utilizes a Variable Transmission with high/low range and reverse, driven by a shaft drive system, making them suitable for a variety of terrains and tasks. This comprehensive service and repair guide provides detailed, step-by-step instructions essential for the maintenance and repair of your Sportsman. It covers critical areas including engine oil specifications and capacity, recommended spark plugs, and procedures for maintaining the primary and secondary clutches, air filter, and cooling system. Additionally, information on brake fluid types and transmission maintenance ensures that owners, mechanics, and technicians have the necessary knowledge to keep these vehicles in optimal working condition.