New replacement cylinder head
Includes cam caps and cam cap bolts
Includes C630 (nickel/aluminum/bronze) valve seats and guides
Competition valve job
Shortened valve guides to accept higher lift cams
Unshrouded combustion chamber
Blended bowl
Stock shaped ports
Does not include valves, springs, or lifters

Fitment
2005 Yamaha YZ125
2006 Yamaha YZ125
2007 Yamaha YZ125
2008 Yamaha YZ125
2009 Yamaha YZ125
2010 Yamaha YZ125
2011 Yamaha YZ125
2012 Yamaha YZ125
2013 Yamaha YZ125
2014 Yamaha YZ125
2015 Yamaha YZ125
2016 Yamaha YZ125
2017 Yamaha YZ125
2018 Yamaha YZ125
2019 Yamaha YZ125
2020 Yamaha YZ125
2021 Yamaha YZ125