{"product_id":"prox-28-ses2440-1-steel-exhaust-valve-spring-kit-yamaha-yz450f-moto-house-mx","title":"ProX Steel Exhaust Valve and Spring Kit 28.SES2440-1 — Yamaha YZ450F 2010-2013","description":"\u003ch1\u003e\u003cstrong\u003eProX Steel Exhaust Valve and Spring Kit 28.SES2440-1 — Yamaha YZ450F 2010-2013\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eReplace your stock titanium exhaust valves with the superior durability of the \u003cstrong\u003eProX Steel Exhaust Valve and Spring Kit\u003c\/strong\u003e. Designed for riders who prioritize longevity and engine reliability, this kit uses \u003cstrong\u003enitrided steel valves\u003c\/strong\u003e that provide exceptional resistance to the extreme thermal stress found in the exhaust port of your Yamaha YZ450F. These steel valves are built to withstand heavy-duty use while maintaining consistent sealing over much longer service intervals than factory components.\u003c\/p\u003e\n\u003cp\u003eBecause steel valves carry more mass than titanium, this ProX kit includes \u003cstrong\u003especially calibrated valve springs\u003c\/strong\u003e manufactured from high-quality chrome vanadium steel. These springs ensure your valvetrain remains stable and performs reliably at high RPMs, preventing valve float and ensuring smooth power delivery. This complete kit is designed to work seamlessly with your existing OEM retainers, bases, and seals, offering a straightforward yet highly effective upgrade for your next cylinder head rebuild.\u003c\/p\u003e\n\u003ch3\u003eTop Features: ProX Steel Exhaust Valve and Spring Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNitrided steel valves offer significantly improved wear resistance and heat tolerance.\u003c\/li\u003e\n\u003cli\u003eIncludes high-performance chrome vanadium springs tailored for steel valve weight.\u003c\/li\u003e\n\u003cli\u003eEngineered for stable high-RPM operation and reduced risk of valve failure.\u003c\/li\u003e\n\u003cli\u003eDirect-fit design compatible with OEM retainers, bases, and valve seals.\u003c\/li\u003e\n\u003cli\u003eThe perfect solution for riders looking to increase engine service intervals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eFitment List\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e0e0e0; margin-top: 15px; margin-bottom: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f7f7f7;\"\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eYear Range\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eVehicle Brand\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eVehicle Model \u0026amp; Sub-Model\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003e2010-2013\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYZ450F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I switch to steel exhaust valves?\u003c\/strong\u003e\u003cbr\u003eA: Exhaust valves are the most thermally stressed component in your engine. Steel is far more resistant to \"tuliping\" and burning than titanium. If you aren't chasing the absolute peak weight savings for a professional racing application, steel is the smart choice for reliability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to replace my valve guides when using these?\u003c\/strong\u003e\u003cbr\u003eA: We highly recommend checking your valve guides for wear. If they are loose, the extra mass of the steel valve will wear your valve seats much faster. If in doubt, replace the guides.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e When installing these valves, ensure you are using a quality assembly lube on the valve stems. Because these are steel-on-steel contact points with the valve guide, proper lubrication during the initial heat cycles is critical to preventing binding and ensuring a perfect seating transition.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz450f-performance-upgrades-engine-mods-and-accessories-moto-house-mx\"\u003eYamaha YZ450F Performance Parts \u0026amp; Upgrades\u003c\/a\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/premium-motorcycle-chemicals-brake-fluid-bike-wash-coolant-chain-lubes\"\u003eHigh-Temp Assembly Lube\u003c\/a\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-motorcycle-tools\"\u003eCylinder Head Rebuild Tools\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eAt Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMoto-House MX – Choice of Champions\u003c\/strong\u003e – Clermont \/ Montverde, FL. Central Florida's premier powersports source with lightning-fast worldwide shipping.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Pro-X","offers":[{"title":"Default Title","offer_id":39690335518803,"sku":"28.SES2440-1","price":141.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/pro-x-exhaust-valve-conversion-set-ti-steel-yamaha-yz450f-2010-2013-28ses2440-1-108053.jpg?v=1735459705","url":"https:\/\/motohousemx.com\/products\/prox-28-ses2440-1-steel-exhaust-valve-spring-kit-yamaha-yz450f-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}