{"product_id":"prox-28-sis2414-2-steel-intake-valve-spring-kit-yamaha-yz250f-moto-house-mx","title":"ProX Steel Intake Valve and Spring Kit 28.SIS2414-2 — Yamaha YZ250F \/ YZ250FX \/ WR250F 2014-2019","description":"\u003ch1\u003e\u003cstrong\u003eProX Steel Intake Valve and Spring Kit 28.SIS2414-2 — Yamaha YZ250F YZ250FX WR250F 2014-2019\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eDitch the maintenance headaches of stock titanium valves with the \u003cstrong\u003eProX Steel Intake Valve and Spring Kit\u003c\/strong\u003e. This kit is specifically engineered to replace OEM components with highly durable \u003cstrong\u003enitrided steel valves\u003c\/strong\u003e, providing significantly increased wear resistance under the extreme heat and stress of off-road riding. By switching to steel, you get a valve that holds its seal longer and offers incredible reliability for long-term engine performance.\u003c\/p\u003e\n\u003cp\u003eBecause steel valves are heavier than titanium, this kit includes \u003cstrong\u003especially designed valve springs\u003c\/strong\u003e manufactured from premium chrome vanadium steel. These springs are engineered to handle the added mass while providing improved performance and durability at high RPMs. Designed as a complete package, this kit is fully compatible with your existing OEM retainers, bases, and valve seals, making it an excellent, cost-effective solution for your next cylinder head rebuild.\u003c\/p\u003e\n\u003ch3\u003eTop Features: ProX Steel Intake Valve and Spring Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNitrided steel construction significantly increases valve life and wear resistance.\u003c\/li\u003e\n\u003cli\u003eIncludes upgraded chrome vanadium springs to compensate for steel valve mass.\u003c\/li\u003e\n\u003cli\u003eOptimized for high-RPM performance and long-term durability.\u003c\/li\u003e\n\u003cli\u003eDirect-fit design works perfectly with stock retainers, bases, and seals.\u003c\/li\u003e\n\u003cli\u003eThe reliable choice for riders looking to maximize 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;\"\u003e2015-2019\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;\"\u003eYZ250FX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003e2015-2019\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;\"\u003eWR250F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003e2014-2018\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;\"\u003eYZ250F\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 would I choose steel valves over titanium?\u003c\/strong\u003e\u003cbr\u003eA: Steel valves are much more durable and resistant to heat-related degradation than titanium valves. While they are slightly heavier, they are the preferred choice for riders who want to extend their service intervals and minimize the risk of valve failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to re-cut my valve seats?\u003c\/strong\u003e\u003cbr\u003eA: Yes, whenever you install new valves, we highly recommend having a machine shop cut the seats. This ensures the valve face mates perfectly with the seat, which is essential for proper heat transfer and engine performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e Since you are moving to a heavier steel valve and an upgraded spring, ensure your valve guides are in perfect condition. Any extra slop in the valve guide will be magnified by the heavier valve and cause the seat to wear prematurely. If the guide is worn, replace it to get the full life out of your new ProX kit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz250f-yz250fx-performance-parts-and-accessories\"\u003eYamaha YZ250F \/ YZ250FX Performance Parts\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":39690289053779,"sku":"28.SIS2414-2","price":129.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/prox-intake-valve-conversion-set-ti-steel-28sis2414-2-2014-2018-yamaha-yz250f-yz250fx-or-wr250f-359903.jpg?v=1735460209","url":"https:\/\/motohousemx.com\/products\/prox-28-sis2414-2-steel-intake-valve-spring-kit-yamaha-yz250f-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}