The KingQuad LT-A400 and LT-F400 series, produced from 2008 through 2013, represent a robust offering in the utility ATV market. These models are powered by a reliable 400cc class, single-cylinder, liquid-cooled engine, typically featuring a carburetor and an automatic CVT transmission with Hi/Lo range and reverse. Known for their durable steel frame, independent front suspension for improved ride quality, and selectable 2WD/4WD capabilities, the KingQuad 400 series was designed to balance capability with value, making it suitable for a variety of tasks from farm work to recreational trail riding. The heritage in powersports engineering underpins the quality and dependability of these ATVs. This comprehensive service and owner's manual covers all essential aspects of maintaining and repairing your KingQuad LT-A400/LT-F400. It provides detailed information on routine maintenance, scheduled servicing, and in-depth repair procedures for all major systems, including the engine, fuel, ignition, cooling, transmission, drivetrain, chassis, suspension, steering, brakes, and electrical systems. The manual includes step-by-step instructions, exploded views, diagnostic flowcharts, and technical specifications, equipping owners and technicians with the knowledge needed for accurate troubleshooting, component replacement, and overall upkeep to ensure optimal performance and longevity of the vehicle.