The Yamaha YFZ450 is amid the top performer when it comes to ATV action and taking down championships. Just ask 6-time GNCC Champ Bill Ballance. One of the lightest, most powerful quads ever, the YFZ450 stakes its claim to merely every magazine shootout and review. It stakes the claim to the 2004 and 2005 GNCC and Quadcross Championships and is the 2005 and 2006 World Four-Stroke Champion. The YFZ450 and the Raptor 660R tied as ATV Illustrated's Sport ATV of the year. The YFZ450 features an electric start. The 449cc dry sump, liquid-cooled, DOHC four-stroke features five titanium valves with a 95mm bore and 63.4mm stroke, producing massive power with a high over-rev capacity and crisp, linear throttle response. The large-capacity radiator is optimally mounted in the frame to guard against damage. Forcing the fuel to the fire, the high performance 39mm Keihin FCR flat-slide carburetor includes a throttle position sensor (TPS) that delivers an ultra-precise air/fuel mixture and crisp throttle response. Sharing some hot performance traits with the YZ dirt bikes, the YFZ450 features a five-speed ratchet-type transmission with a heavy-duty clutch that combines to deliver power to the rear tires with maximum efficiency. The A-arm front suspension features fully adjustable, Kayaba piggyback shocks with 9.1 inches of travel and separate adjusters for preload, rebound and compression damping. The quad boasts a whopping 10.6 inches of travel in the rear with its ultra-rigid cast aluminum swingarm that is controlled by a fully adjustable Showa shock. The adjusters allow for preload, rebound and compression damping.