{"product_id":"rfx-fxaf4000455no-air-filter-yamaha-yz250f-wr250f-moto-house-mx","title":"RFX Foam Air Filter FXAF4000455NO - Yamaha YZ250F \/ YZ450F \/ WR250F 2010-2019","description":"\u003ch1\u003e\u003cstrong\u003eRFX Foam Air Filter FXAF4000455NO - Yamaha YZ250F \/ YZ450F \/ WR250F 2010-2019\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe RFX Air Filter provides high-capacity intake filtration and smooth airflow for Yamaha four-stroke motocross and off-road models. Manufactured by Multi Air, this \u003cstrong\u003etwin-layer foam air filter\u003c\/strong\u003e lets your engine breathe cleanly while maintaining a protective barrier against airborne roost, sand, and fine trail dust.\u003c\/p\u003e\n\u003cp\u003eEngineered with \u003cstrong\u003ebreathable twin-layered foam\u003c\/strong\u003e, the coarse outer layer captures larger mud, grit, and roost, while the dense inner layer catches micro-particulates before they can enter the intake boot. Built using flame-retardant nonflammable foam suited for four-stroke applications, it provides an exact airbox fitment developed through Multi Air's 30-plus years of off-road competition experience.\u003c\/p\u003e\n\u003ch3\u003eTop Features: RFX Foam Air Filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBreathable twin-layer foam construction delivers steady intake airflow while stopping fine silt and dust.\u003c\/li\u003e\n\u003cli\u003eNonflammable flame-retardant foam provides added safety against backfire combustion on four-stroke models.\u003c\/li\u003e\n\u003cli\u003ePrecision-molded sealing base ensures a snug, gap-free seal against the Yamaha airbox housing.\u003c\/li\u003e\n\u003cli\u003eDeveloped and manufactured by Multi Air with over 30 years of off-road racing filtration experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/p\u003e\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eVehicle Brand\u003c\/th\u003e\n\u003cth\u003eVehicle Model \u0026amp; Sub-Model\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2010-2019\u003c\/td\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eWR250F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2018\u003c\/td\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZ250F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2017\u003c\/td\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZ450F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: Does this RFX air filter come pre-oiled or dry?\u003c\/b\u003e\u003cbr\u003eA: This filter (MPN FXAF4000455NO) is supplied dry (un-oiled) and must be properly treated with foam air filter oil prior to installation.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Why is nonflammable foam used on 4-stroke models?\u003c\/b\u003e\u003cbr\u003eA: Four-stroke powerplants can backfire through the intake tract. Nonflammable foam helps prevent backfire sparks from igniting the filter media or oil.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Who manufactures these air filters for RFX?\u003c\/b\u003e\u003cbr\u003eA: RFX air filters are manufactured by Multi Air, an industry leader with over 30 years of air filter production experience.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e When oiling a dry foam air filter, work foam filter oil thoroughly through both foam layers until the color is completely uniform across the entire surface. Gently squeeze out any excess oil without twisting or wringing the seams, and allow the carrier solvent to evaporate for 15 minutes before seating the filter cage into the Yamaha airbox.\u003c\/p\u003e\n\u003ch3\u003eRecommended Pairings:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz250f-yz250fx-performance-parts-and-accessories\"\u003eYamaha YZ250F Performance Parts \u0026amp; Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\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\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/premium-motorcycle-chemicals-brake-fluid-bike-wash-coolant-chain-lubes\"\u003eAir Filter Cleaners \u0026amp; Maintenance Chemicals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\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. We pride ourselves on great customer service, and every item ships FAST - straight to your door.\u003c\/p\u003e\n\u003cp\u003e\u003ci\u003e\u003cstrong\u003eMoto-House MX - Choice of Champions\u003c\/strong\u003e - Your premier powersports source with great customer service and lightning-fast shipping straight to your door.\u003c\/i\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"RFX","offers":[{"title":"Default Title","offer_id":45868098912339,"sku":"FXAF 40004 55NO","price":23.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/aef8-6939e3ce3dae3.png?v=1785097837","url":"https:\/\/motohousemx.com\/products\/rfx-fxaf4000455no-air-filter-yamaha-yz250f-wr250f-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}