This repair manual provides comprehensive guidance for the KXR50 Mongoose ATV and KXR90 Mongoose ATV. These all-terrain vehicles are engineered for recreational riding and off-road use, combining robust construction with reliable performance. The brand is recognized for its commitment to quality and durability, ensuring these ATVs deliver an enjoyable and dependable experience for enthusiasts. This manual serves as an essential resource for maintaining and repairing your ATV. It covers a wide range of topics, including general information, routine maintenance schedules, engine service, fuel and lubrication systems, electrical components, and advanced troubleshooting techniques. By following the detailed procedures and technical specifications outlined within, owners and technicians can ensure their vehicles remain in optimal condition, maximizing performance and longevity.