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Removing centrifugal mass lets the machine rev into its power band easier
Primary drive gear shaft roller bearings
The forged steel components and friction-reducing bearings give you the hard-hitting acceleration and velvety smooth power delivery you need for your ride
Wristpin bearings
Piston Head Type Dome Piston Oversize Standard
09-24 Yamaha YFZ450R YFZ 450R KIBBLEWHITE +1mm Intake + Exhaust Valves Seals Kit LT250R Removing centrifugal mass lets theKibblewhite Performance +1mm Larger Valves (All 5) The Best On The Market! Fits Yamaha YFZ450 Carbureted Models Years 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Fits Yamaha YFZ450R and YFZ450X Fuel Injected Models Years 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Fits Yamaha YZ450F Years 2003 2009 Fits Yamaha WR450F Years 2003 2015 Features: WHITE Diamond Stainless Steel +1mm Valve Set (All 5) Part # 80