This manual covers the Beta RR 4T 450, an off-road motorcycle renowned in the enduro community for its performance and build quality. Motorcycles, an Italian brand, have a rich heritage in off-road and trials riding, with the RR 4T series representing their continuous evolution in four-stroke off-road capabilities. This comprehensive factory service repair manual provides in-depth guidance for enthusiasts and experienced mechanics alike, offering detailed, step-by-step instructions for maintenance and repair. The scope of this manual is extensive, encompassing all major systems of the Beta RR 4T 450, including the engine top end, fuel system, cooling system, clutch, lubrication system, crankshaft, transmission, wheels, tires, brakes, suspension, steering, frame, and electrical system. It provides factory-level information with hundreds of photos and illustrations, covering general information, routine servicing, preventative maintenance, and complete disassembly and repair procedures. This resource is designed to empower owners and technicians to maintain and repair the vehicle effectively, ensuring optimal performance and longevity.