The Honda TRX450R, including the TRX450ER variant, is a high-performance sport ATV renowned for its potent engine and capable chassis. Produced between 2004-2009 and again from 2012-2014, this model is engineered for demanding use in recreational trail riding, cross-country racing, and motocross. It embodies a commitment to quality and performance, offering riders a machine built for power, agility, and durability. The TRX450R is celebrated for its excellent handling characteristics and robust construction, making it a formidable competitor in its class. This comprehensive service and repair manual covers the Honda TRX450R and TRX450ER models from 2004 through 2014. It serves as an indispensable resource for owners, mechanics, and technicians, detailing every aspect of maintenance, repair, and troubleshooting. The manual provides in-depth coverage of the engine, transmission, chassis, suspension, and electrical systems, including complete teardown and rebuild procedures, diagnostic guides, and essential technical specifications. With extensive visual aids and clear instructions, this manual ensures that the vehicle can be kept in optimal condition, maximizing its performance and longevity.