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Replaces the OEM valves and valve springsSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel...

Prox Piston Kit - 94.95 Mm - Husqvarna Fe450 | Ktm 450Exc-F 01.6440.A KTM -- 450 EXC-F -- (2020); Husqvarna -- FE 450 -- (2020)

Prox Piston Kit - 94.95 Mm - Yamaha Yfz450/Yfz450R 01.2435.A Yamaha -- YFZ 450R 4x2 -- (2011, 2022, 2014, 2023, 2010, 2009, 2025, 2024, 2015, 2021, 2012, 2017, 2013, 2016, 2019, 2020, 2018); Yamaha...

Prox Piston Kit - 94.96 Mm - Gas Gas | Yamaha 01.2429.B Yamaha -- WR 450 F -- (2008, 2007, 2009, 2004, 2005, 2006, 2003, 2010, 2011, 2014, 2015, 2013, 2012); Yamaha -- YZ 450 F -- (2009, 2008, 2005,...

Prox Piston Kit - 94.97 Mm - Gas Gas | Yamaha 01.2429.C Yamaha -- WR 450 F -- (2004, 2009, 2011, 2010, 2007, 2006, 2008, 2003, 2005, 2014, 2015, 2012, 2013); Yamaha -- YZ 450 F -- (2008, 2007, 2005,...

Prox Piston Kit - 95.96 Mm - Honda Trx450Er/Trx450R 01.1496.A Honda -- TRX450ER -- (2012, 2013, 2008, 2007, 2009, 2014, 2006); Honda -- TRX450R -- (2009, 2008, 2007, 2006)

Prox Piston Kit - 92.91 Mm - Polaris Rzr Xp Turbo 01.5920.A Polaris -- RZR XP Turbo EPS 4x4 -- (2016, 2020, 2017, 2019, 2021, 2018); Polaris -- RZR XP Turbo S 4x4 -- (2018, 2020, 2019); Polaris --...

Prox Piston Kit - 95.97 Mm - Honda Trx450Er/Trx450R 01.1496.B Honda -- TRX450ER -- (2012, 2014, 2013, 2008, 2006, 2009, 2007); Honda -- TRX450R -- (2006, 2008, 2009, 2007)

Prox Piston Kit - 96.95 Mm - Yamaha Wr450F/Yz450F/Yz450Fx 01.2448.A Yamaha -- WR 450 F -- (2020, 2019); Yamaha -- YZ 450 FX -- (2020, 2019); Yamaha -- YZ 450 F -- (2018, 2019)

Prox Piston Kit - 94.96 Mm - Yamaha Yfz450/Yfz450R 01.2436.B Yamaha -- YFZ 450R SE 4x2 -- (2014, 2016, 2018, 2010, 2020, 2013, 2009, 2015, 2019, 2012, 2011, 2017, 2022, 2023, 2021, 2024, 2025);...

Prox Piston Kit - 96.94 Mm - Ktm 01.6427.A KTM -- 450 SX-F -- (2011, 2012, 2009, 2008, 2007, 2010); KTM -- 450 SMR -- (2012, 2009, 2011, 2008, 2010); KTM -- 450 ATV SX -- (2009, 2010)

Prox Piston Kit - 94.95 Mm - Gas Gas | Yamaha 01.2429.A Yamaha -- YZ 450 F -- (2007, 2003, 2008, 2009, 2004, 2005, 2006); Yamaha -- WR 450 F -- (2005, 2006, 2003, 2009, 2011, 2007, 2008, 2010, 2004,...