This manual covers the 2008 Trail Boss 330 and Trail Blazer 330, popular all-terrain vehicles renowned for their utility and trail-riding capabilities. These mid-size ATVs are equipped with a 330cc, air-cooled, 4-stroke engine delivering approximately 18-20 HP and 18-20 lb-ft of torque, paired with an automatic CVT transmission featuring high, low, neutral, and reverse drive modes. With a focus on reliable performance, these vehicles offer a ground clearance of about 9.5 inches and a wheelbase of approximately 48 inches, making them well-suited for diverse off-road conditions. With its extensive history in powersports, these models were engineered to provide a balanced blend of power and efficiency for recreational and utility use. This comprehensive factory service manual provides essential maintenance, repair, and troubleshooting information for owners and technicians. It details procedures for all major vehicle systems, including the engine, fuel system, cooling system, transmission, clutch, final drive, body and frame, steering, suspension, brakes, and electrical systems. The manual includes step-by-step instructions, high-quality pictures, diagrams, and exploded parts views for clear understanding. It covers everything from routine scheduled maintenance, such as oil changes and filter replacements, to complete component overhauls and troubleshooting common issues like carburetor clogs or wear on CVT belts and suspension components. Detailed color-coded wiring diagrams are also provided to aid in electrical system diagnostics.