The Polaris Scrambler, offered in 400 and 500cc engine variants, represents a significant entry in the sport All-Terrain Vehicle (ATV) market from the late 1990s and early 2000s. These performance-oriented ATVs were engineered to provide versatility and power, featuring both 2-wheel drive and 4-wheel drive configurations to tackle a variety of terrains. With their sport-tuned suspension and robust engine performance for their era, the Scrambler models were designed to deliver an engaging riding experience, competing with other prominent brands in the performance ATV segment. This comprehensive manual serves as an essential guide for owners and technicians alike, covering all aspects of the 1999 and 2000 Scrambler 400 and 500 models. It details routine maintenance procedures, in-depth engine repair, fuel and cooling systems, transmission, steering, brakes, and the electrical system. The manual provides clear instructions for repairs, parts lookup, and advanced troubleshooting, ensuring that users can effectively maintain, diagnose, and repair their vehicles to keep them in optimal working condition.