What differences are there between the 2004 crf450 and the 2013 crf450?

The 2004 CRF450 featured a more traditional design with a heavier steel frame and a carbureted engine, while the 2013 model transitioned to a lighter aluminum frame and utilized fuel injection, offering improved performance and efficiency. The 2013 version also featured advancements in suspension technology, with better overall handling and stability. Additionally, the 2013 model had updated ergonomics, providing a more comfortable riding experience. Overall, the 2013 CRF450 represented significant technological and design advancements over the 2004 model.