{"product_id":"oem-goodman-43-gas-burner-orifice-for-ams80904bna-b4089343","title":"OEM Goodman #43 Gas Burner Orifice for AMS80904BNA — B4089343","description":"\u003ch2\u003eGoodman B4089343 Burner Orifice (#43)\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eB4089343 burner orifice\u003c\/strong\u003e is a genuine OEM #43-drilled gas spud for the Goodman\/Amana \u003cstrong\u003eAMS80904BNA\u003c\/strong\u003e gas furnace. Threaded into the manifold, each orifice meters the exact volume of natural gas delivered to its in-shot burner — setting the input rate (BTU) and shaping the flame. A worn, corroded, or incorrectly-sized orifice throws off the gas\/air mixture, causing lifting flames, sooting, delayed ignition, or an under-fired furnace. Using the factory-specified drill size is essential for safe, on-spec combustion.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: Burner orifice \/ gas spud\u003c\/li\u003e\n\u003cli\u003eDrill size: #43 (natural gas)\u003c\/li\u003e\n\u003cli\u003eFunction: Meters gas flow to in-shot burner\u003c\/li\u003e\n\u003cli\u003eMaterial: Brass\u003c\/li\u003e\n\u003cli\u003eSold: Individually — match orifice count to your model\u003c\/li\u003e\n\u003cli\u003eFits: Goodman\/Amana AMS80904BNA and related 80% furnaces\u003c\/li\u003e\n\u003cli\u003eOEM Part #: B4089343\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM B4089343 is precision-drilled to the #43 size the AMS80904BNA is rated for, guaranteeing the correct BTU input and clean flame. Aftermarket orifices can vary in bore diameter and thread quality, risking over- or under-firing. Because this part directly controls the fuel rate, we strongly recommend the genuine Goodman orifice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2 of 5).\u003c\/strong\u003e Unthread the old spud from the manifold and thread in the exact replacement — do not enlarge or re-drill orifices. Shut off gas and power first. Confirm orifice size matches your fuel type (natural gas vs. LP) and have a technician verify firing rate.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057705566579,"sku":"GOODMAN-7064","price":12.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-43-gas-burner-orifice-for-ams80904bna-b4089343","provider":"National HVAC Parts","version":"1.0","type":"link"}