{"product_id":"sierra-18-3891-head-gasket-for-yamaha-outboard-replaces-oem-61a-11181-00-a0","title":"Sierra 18-3891 Head Gasket for Yamaha Outboard, Replaces 61A-11181-00-A0","description":"\u003cp\u003eThe Sierra 18-3891 Head Gasket is a replacement head gasket engineered for Yamaha outboard motors. It seals the mating surface between the cylinder head and powerhead, maintaining proper compression and preventing coolant or combustion leaks at the head joint. Each package includes one gasket, and Sierra states that every Sierra product meets or exceeds the original equipment part it replaces, making the 18-3891 a direct functional substitute for the factory Yamaha head gasket.\u003c\/p\u003e\u003cp\u003eThis gasket is designed for installation whenever the cylinder head is removed for service, such as during a powerhead rebuild, decarbonizing, or repair of a blown head gasket. Installing a new gasket at reassembly, rather than reusing the old one, helps restore a proper seal and compression.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3891\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Yamaha Outboard Head Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity per Package:\u003c\/strong\u003e 1 gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.26 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999753731\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eYamaha outboard motors\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e61A-11181-00-A0\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3891 used for?\u003c\/strong\u003e It is a head gasket that seals the joint between the cylinder head and powerhead on a Yamaha outboard motor, maintaining compression and preventing leaks at that surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part number does the 18-3891 replace?\u003c\/strong\u003e The Sierra 18-3891 corresponds to Yamaha OEM part number 61A-11181-00-A0.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e One Sierra 18-3891 head gasket is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3891 a genuine Yamaha part or aftermarket?\u003c\/strong\u003e The 18-3891 is a Sierra-manufactured aftermarket replacement, not a genuine Yamaha-branded part, though Sierra states it meets or exceeds the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3891 fit all Yamaha outboards?\u003c\/strong\u003e The 18-3891 is designed for Yamaha outboard motor applications; consult the OEM cross-reference number 61A-11181-00-A0 to confirm fit against your motor's original gasket part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this head gasket be replaced?\u003c\/strong\u003e The 18-3891 should be installed as a new gasket any time the cylinder head is removed from the powerhead, such as during a rebuild or repair, rather than reusing the old gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3891 weigh?\u003c\/strong\u003e The Sierra 18-3891 head gasket weighs 0.26 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3891?\u003c\/strong\u003e The UPC for the Sierra 18-3891 Head Gasket is 030999753731.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-3891 be reused after removal?\u003c\/strong\u003e No, a head gasket like the 18-3891 is a single-use sealing component and should be replaced with a new one any time the head is removed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand makes part number 18-3891?\u003c\/strong\u003e Part number 18-3891 is manufactured by Sierra.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988169404635,"sku":"SIE-18-3891","price":60.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3891_lg__47117.1558126991.500.750.jpg?v=1785188299","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3891-head-gasket-for-yamaha-outboard-replaces-oem-61a-11181-00-a0","provider":"Good Vibes Marina","version":"1.0","type":"link"}