Introducing the most powerful belt built for the most extreme machines Daycos revolutionary new ATV belts are engineered for those monster machines powered by 800cc and above engines. Specially-formulated high temperature Neoprene with the highest level of Aramid fiber loading available delivers track-churning performance for the most aggressive riders.This innovative break-through design features deeper cogs on top and rounded cogs on the bottom for ultimate flexibility and longer belt life.The Dayco XTX belt offers: Faster and more consistent throttle response at high speeds Quicker throttle response at mid-speed acceleration Greater secondary acceleration at high RPMs Reduction in slippage during the highest levels of torque Increased horsepower capacity Better performance during deceleration (more responsive engine braking) Tested and proven reliable at well over 12,000 RPMs Cooler running than the leading competitorsThis race-tested Dayco XTX belt gives extreme riders the best out-of-the-hole acceleration, throttle response and durability, for the ride of a lifetimeevery time! Fits: Yamaha YFM300A 2WD GRIZZLY 2012-2015 YFM300A GRIZZLY AUTO 2X4 2011 YFM350A BRUIN (Auto) 2WD 2004-2006 YFM350FA BRUIN (Auto) 4WD 2004-2006 YFM400 KODIAK 2000-2006 YFM400A KODIAK 2X4 2000-2004 YFM400FA GRIZZLY (AUTO) 4WD 2007 YFM400FW KODIAK 4X4 2000-2006 YFM450 Kodiak 2003-2006 YFM450FA GRIZZLY AUTO 4WD 2007-2016 YFM450FAP GRIZZLY EPS AUTO 4WD 2013-2014 YFM450FAP GRIZZLY EPS AUTO 4X4 2011-2012 YXR450 RHINO 2006-2009