This manual provides comprehensive technical information for 400/450 EXC, SMR, and SXS models equipped with the 400/450 LC4 engine, covering production years 2000 through 2007. These versatile motorcycles, known for their Austrian engineering and performance capabilities, are designed for a range of applications from dual-sport riding to competitive motocross and supermoto. The LC4 engine platform is celebrated for its robust torque and reliability, forming the core of these capable machines.

This Service and Repair Manual is designed to be an indispensable resource for owners and technicians alike. It offers detailed coverage of engine service and repair, including complete disassembly, inspection, overhaul, and reassembly procedures for the engine core, cooling system, lubrication system, fuel system, ignition system, and exhaust system. The manual also includes routine maintenance schedules, troubleshooting guides for common issues, and step-by-step instructions for component replacement and engine rebuilds, ensuring optimal performance and longevity of your motorcycle.