The YZ85, including its YZ85LW variant, represents a performance-oriented 85cc two-stroke competition motocross motorcycle. Produced from 2002 through 2006, this model is recognized for its robust engine and agile handling, making it a staple for young riders entering the competitive motocross arena. Extensive history in off-road racing underpins the YZ85's development, focusing on delivering a machine that excels in demanding race conditions. Its engineering emphasizes power delivery and rider control, positioning it as a competitive choice against other leading motocross bikes of its era.

This comprehensive service manual provides in-depth information for the maintenance, repair, and troubleshooting of the 2002-2006 YZ85 and YZ85LW models. It covers all critical systems, including the engine's top and bottom end, cooling, lubrication, ignition, and carburetor systems, as well as the chassis, suspension, steering, and braking components. Detailed procedures for scheduled maintenance, component disassembly and reassembly, and electrical system diagnostics are included. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their YZ85.