ProX Intake Valve & Spring Kit Yamaha YFZ450R/X WR450F YZ450F Gas Gas EC450F (2003-2023)
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ProX Intake Valve & Spring Kit β Yamaha YFZ450 / YFZ450R/X / WR450F / YZ450F | Gas Gas EC 450F
π οΈ Description
Increase reliability and performance with the ProX Intake Valve & Spring Kit. Designed as a direct replacement for OEM components, this kit includes nitrided steel intake valves and premium chrome vanadium valve springs for superior durability under extreme conditions. Built for Yamaha sport quads, off-road bikes, and Gas Gas EC 450F models, the ProX kit provides excellent high-RPM control while maintaining OEM compatibility for easy installation.
β Whatβs Included
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Set of steel intake valves
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Set of intake valve springs
π¦ Fitment
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2009β2023 Yamaha YFZ450R / SE
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2007β2008 Yamaha YFZ450 SE
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2006β2007 Yamaha YFZ450 Bill Balance Edition
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2006 Yamaha YFZ450 SE 4x2
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2004β2009 Yamaha YFZ450 / YFZ450 X 4x2
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2004β2005 Yamaha YFZ450 LE 4x2
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2003β2015 Yamaha WR450F
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2003β2009 Yamaha YZ450F
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2013β2015 Gas Gas EC 450F
π‘οΈ Warranty Info
ProX valve kits include a limited manufacturerβs warranty against defects in materials and workmanship. Warranty does not cover race damage, improper installation, or poor maintenance.
π Key Features
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Direct OEM replacement intake valves and springs
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Nitrided steel valves for reduced wear and increased service life
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Chrome vanadium springs engineered for high-RPM durability
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Designed to work with OEM retainers, bases, and valve seals
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Improved reliability under racing and high-load conditions
π¦ Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
