The YFZ350, affectionately known as the Banshee, is a legendary sport All-Terrain Vehicle (ATV) that dominated the off-road scene from its introduction in 1987 through 2003, the period covered by this manual. Renowned for its potent liquid-cooled, 347cc two-stroke engine, reed valve induction, and dual Mikuni carburetors, the Banshee delivered exhilarating performance, with an estimated 50+ horsepower. Its robust construction, including a liquid-cooling system and a 6-speed manual transmission with reverse on many models, combined with a chain drive, made it a formidable machine for recreational riding and dune enthusiasts. The ATV’s design emphasized agility and power, featuring dual front hydraulic disc brakes and a single rear hydraulic disc brake, wide handlebars, and aggressive footpegs for enhanced control and rider confidence. This comprehensive workshop service manual provides essential information for the maintenance, repair, and troubleshooting of the YFZ350 Banshee models from 1987 to 2003. It covers a wide array of systems, including detailed procedures for engine mechanicals, fuel and ignition systems, cooling, transmission, suspension, steering, braking, and electrical systems. The manual offers step-by-step guidance for scheduled maintenance, engine and carburetor rebuilds, and various diagnostic procedures, making it an indispensable resource for owners and technicians alike. With its high-resolution diagrams, exploded views, and clear, concise instructions, this manual ensures accurate and efficient upkeep, helping to preserve the performance and longevity of this iconic sport ATV.