This service manual covers the Bruin 350, model codes YFM350 and BAT350, from the 2004 model year. As a first-generation model, the Bruin 350 was designed as a capable and reliable utility all-terrain vehicle, suitable for a range of activities including trail riding and light work. Key features include its automatic Ultramatic CVT transmission, selectable 2WD/4WD, independent front suspension, and a robust air-cooled 4-stroke engine. The reputation for engineering quality and dependability is evident in this model, which offered a competitive package in its class. This comprehensive service manual provides detailed information essential for the maintenance, repair, and troubleshooting of your Bruin 350. It covers a wide array of systems, including engine mechanicals, fuel and lubrication systems, cooling, electrical components, drive systems, suspension, steering, brakes, frame, and bodywork. Within its pages, you will find procedures for routine maintenance, inspections, component removal and installation, adjustments, and wiring diagram interpretation. The manual is structured to assist both novice owners and experienced technicians in keeping the vehicle in optimal condition, ensuring its longevity and performance.