Prox Valve And Spring Kit - Intake - Gas Gas | Yamaha 28.Sis2424-2

• Replaces the OEM valves and valve springs
• Steel, nitrided valves for increased durability and less wear under extreme conditions
• Stronger valve springs deal with the extra weight of the steel valves
• Springs are made from premium chrome vanadium steel for higher performance and durability at high rpm
• Kit contains a set of steel intake or exhaust valves plus a set of specially designed valve springs; can be installed using the OEM retainers, bases and valve seals

Yamaha -- WR 450 F -- (2009, 2011, 2012, 2014, 2007, 2015, 2008, 2005, 2013, 2003, 2006, 2004, 2010); Yamaha -- YZ 450 F -- (2008, 2009, 2005, 2006, 2003, 2004, 2007); Yamaha -- YFZ 450R 4x2 -- (2016, 2012, 2015, 2021, 2009, 2020, 2011, 2013, 2017, 2019, 2010, 2014, 2018, 2022, 2023); Yamaha -- YFZ 450 X 4x2 -- (2006, 2009, 2004, 2005, 2007, 2008); Yamaha -- YFZ 450 4x2 -- (2006, 2008, 2007, 2004, 2005, 2009); Yamaha -- YFZ 450R SE 4x2 -- (2010, 2020, 2011, 2017, 2014, 2016, 2018, 2013, 2021, 2012, 2009, 2022, 2023, 2015, 2019); Yamaha -- YFZ 450 LE 4x2 -- (2004, 2005); Yamaha -- YFZ 450 SE 4x2 -- (2007, 2008, 2006); Yamaha -- YFZ 450 Bill Balance Edition 4x2 -- (2006, 2007); Gas Gas -- EC 450F -- (2013, 2015, 2014)