{"product_id":"prox-exhaust-valve-and-spring-conversion-kit-28-ses2414-1-for-yamaha-yz250f-yz250fx-and-wr250f","title":"ProX Exhaust Valve and Spring Conversion Kit 28.SES2414-1 for Yamaha YZ250F, YZ250FX and WR250F","description":"Latest addition to the ProX program is the Exhaust Valve \u0026amp; Spring Kits. This kit is offered as an alternative where the OEM application uses Titanium valves. ProX has now developed the Exhaust Valve \u0026amp; Spring Kits, containing a set of steel intake or exhaust valves plus a set of specially designed stronger valve springs. The ProX kit just replaces the OEM valves \u0026amp; valve springs and can be installed using the OEM retainers, bases and valve seals.\n\u003cp\u003eThe ProX Exhaust Valve and Spring Conversion Kit, manufacturer part number 28.SES2414-1 and vendor part number 19-9549, provides a durable steel-valve replacement for select Yamaha four-stroke engines originally equipped with titanium exhaust valves. This complete kit includes steel exhaust valves and specially designed heavy-duty valve springs, offering a practical alternative for engine rebuilds and high-use applications.\u003c\/p\u003e\u003cp\u003eProX nitrided steel valves feature increased surface hardness and a smooth finish designed to reduce friction between the valve stem and guide. The included springs are manufactured from premium chrome vanadium steel to support the additional weight of steel valves while maintaining reliable performance at high engine speeds. The kit can be installed with the original equipment retainers, spring bases, and valve seals, eliminating the need for additional engine modifications.\u003c\/p\u003e\u003cp\u003eDesigned for fitment on 2014–2017 Yamaha YZ250F models, 2015–2017 Yamaha YZ250FX models, and 2015–2017 Yamaha WR250F models, this ProX conversion set is intended for replacing worn or damaged exhaust valves and springs during a cylinder head rebuild. Verify the motorcycle model year and engine configuration before installation to ensure proper application.\u003c\/p\u003e\u003cp\u003eAs a complete replacement package, the ProX 28.SES2414-1 kit supports a straightforward and efficient exhaust valve service using compatible OEM cylinder head components. It is suitable for riders, technicians, and engine builders seeking increased valve durability without changing the original cylinder head design.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: Exhaust valve and spring conversion kit for select Yamaha four-stroke motorcycles\u003c\/li\u003e\n\u003cli\u003eBrand: ProX\u003c\/li\u003e\n\u003cli\u003eManufacturer: ProX\u003c\/li\u003e\n\u003cli\u003eManufacturer part number: 28.SES2414-1\u003c\/li\u003e\n\u003cli\u003eVendor part number: 19-9549\u003c\/li\u003e\n\u003cli\u003eValve construction: Nitrided steel valves provide increased durability, high surface hardness, and reduced stem-to-guide friction\u003c\/li\u003e\n\u003cli\u003eSpring construction: Premium chrome vanadium steel valve springs support reliable performance at high RPM\u003c\/li\u003e\n\u003cli\u003eInstallation: Uses OEM retainers, spring bases, and valve seals without additional engine modifications\u003c\/li\u003e\n\u003cli\u003eFitment: 2014–2017 Yamaha YZ250F, 2015–2017 Yamaha YZ250FX, and 2015–2017 Yamaha WR250F\u003c\/li\u003e\n\u003cli\u003eKit contents: Complete exhaust valve and stronger valve spring replacement package\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2014 Yamaha YZ250F\u003cbr\u003e\n2015 Yamaha WR250F\u003cbr\u003e\n2015 Yamaha YZ250F\u003cbr\u003e\n2015 Yamaha YZ250FX\u003cbr\u003e\n2016 Yamaha WR250F\u003cbr\u003e\n2016 Yamaha YZ250F\u003cbr\u003e\n2016 Yamaha YZ250FX\u003cbr\u003e\n2017 Yamaha WR250F\u003cbr\u003e\n2017 Yamaha YZ250F\u003cbr\u003e\n2017 Yamaha YZ250FX\u003cbr\u003e\n2018 Yamaha WR250F\u003cbr\u003e\n2018 Yamaha YZ250F\u003cbr\u003e\n2018 Yamaha YZ250FX\u003cbr\u003e\n2019 Yamaha WR250F","brand":"PROX","offers":[{"title":"Default Title","offer_id":67555801301227,"sku":"19-9549","price":146.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/5cc2-572a591506ade.jpg?v=1790744477","url":"https:\/\/ctracingservices.com\/products\/prox-exhaust-valve-and-spring-conversion-kit-28-ses2414-1-for-yamaha-yz250f-yz250fx-and-wr250f","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}