The FC 450, produced between 2000 and 2004, is a high-performance, 4-stroke, single-cylinder motocross motorcycle engineered for competitive racing. This off-road machine, known for its specialized design and distinct heritage as a Swedish manufacturer later integrated into a larger group, prioritizes raw power and agility on the track. Its robust construction, likely featuring an aluminum or steel frame and advanced suspension systems, including upside-down front forks and a monoshock rear, is tailored for the demanding environment of motocross. The FC 450-4 represents a commitment to delivering a competitive edge in the 450cc class, directly challenging established models from other leading brands. This comprehensive workshop manual serves as an essential resource for owners and mechanics, offering detailed guidance on the repair and maintenance of the FC 450-4. It covers critical aspects of the vehicle, including in-depth engine disassembly, servicing of individual parts, fuel system operation, and complete engine assembly. Furthermore, the manual provides essential information on the electric system, complete with wiring diagrams, and outlines troubleshooting procedures to diagnose and resolve potential issues. With its focus on detailed repair and rebuild instructions, periodic maintenance schedules, and technical specifications, this manual empowers users to effectively maintain and preserve the performance and reliability of their motocross bike.