This valve kit includes 3 valves, 3 springs, 3 seats, and 3 retainers everything shown in the picture. The key features are:
Nitride-coated components: Enhance heat transfer and reduce carbon build-up, increasing the lifespan of the valve train.
Valves: Forged from a single piece for weight reduction and improved flow, made from 21-2N/SUH35HT stainless steel.
Springs: Made from SWOSC-V material (oil-tempered steel wire).
Progressive springs: Feature more coils on one end and should be installed with the heavier end towards the bottom.
Non-progressive springs: Paint-marked to indicate the top and should be installed at the top of the spring.
Seats & Retainers: Made from 4041 steel for increased strength and durability.
Compatible with the following Yamaha models:
2004 YFZ450
2005 YFZ450
2006 YFZ450
2007 YFZ450
2008 YFZ450
2009 YFZ450
2009 YFZ450R
2010 YFZ450R
2010 YFZ450X
2011 YFZ450R
2011 YFZ450X
2012 YFZ450
2012 YFZ450R
2013 YFZ450
2013 YFZ450R
2014 YFZ450R
2015 YFZ450R
2016 YFZ450R
2017 YFZ450R
2018 YFZ450R
2019 YFZ450R
2020 YFZ450R
2021 YFZ450R
2022 YFZ450R
2023 YFZ450R