This manual covers the Bruin 350, a first-generation All-Terrain Vehicle (ATV) produced from 2004 to 2006. Known for its robust engineering and reliable performance, this 4x4 ATV is equipped with a 348cc, 4-stroke, SOHC, air-cooled engine featuring a Mikuni BSR33 carburetor and a Continuously Variable Transmission (CVT) with forward, neutral, and reverse gears. Its substantial dimensions, including a length of 1990 mm and a ground clearance of 260 mm, make it well-suited for a variety of off-road applications. This comprehensive workshop repair service manual provides detailed guidance for the repair, service, restoration, maintenance, and diagnosis of the Bruin 350. It includes clear, step-by-step instructions accompanied by illustrated and zoomable diagrams, as well as exploded views, to assist owners, mechanics, and technicians in performing essential upkeep and complex repairs. The manual also details crucial technical specifications, such as recommended engine oil, fluid capacities, spark plug gap, and tire pressures, ensuring the vehicle remains in optimal condition.