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The Yamaha YFZ450 is a high-performance, four-stroke ATV (All-Terrain Vehicle). Introduced in 2003 as a 2004 model, it was a huge leap forward relative to its competition. It uses many light-weight materials to give it the lowest dry-weight (350 lbs.) of any 450-class sport ATV. They also tend to have more power than that of the Honda trx450r.
This ATV was considered "revolutionary" and the "biggest step toward an off the showroom floor race ready ATV available by any the four major Japanese manufactures". By the end of the 2004 ATV racing season, three of the four National Championships were claimed by riders riding the Yamaha YFZ450: Keith Little, Brandon and Bill Ballance and Brett Oakley.