{"product_id":"kimpex-1","title":"NGK — BPR6EFS Standard Marine Spark Plug — 901421","description":"\u003ch2\u003eNGK BPR6EFS Standard Marine Spark Plug — Stock No. 3623\u003c\/h2\u003e\u003cp\u003eThe NGK BPR6EFS is a standard marine spark plug for verified gasoline inboard and sterndrive applications. Its copper core supports heat dissipation, while the corrosion-resistant trivalent metal plating and high-strength ceramic insulator are designed for dependable marine ignition service. Confirm the exact engine model and serial number before ordering.\u003c\/p\u003e\u003ch3\u003ePart Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e NGK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNGK Part Number:\u003c\/strong\u003e BPR6EFS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNGK Stock Number:\u003c\/strong\u003e 3623\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury\/Quicksilver Reference:\u003c\/strong\u003e 816336Q\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Standard marine spark plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Diameter:\u003c\/strong\u003e 14.0 mm \/ 0.551 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length:\u003c\/strong\u003e 17.5 mm \/ 0.689 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSocket Size:\u003c\/strong\u003e 16 mm \/ approximately 5\/8 in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNGK Reference Gap:\u003c\/strong\u003e 0.8 mm \/ approximately 0.032 in\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 3.0L \/ 181 CID:\u003c\/strong\u003e From serial 0L010042\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 4.3L Gen+:\u003c\/strong\u003e From serial 0L010065\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 4.3L EFI Gen+:\u003c\/strong\u003e From serial 0L012009\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 5.0L EFI Gen+:\u003c\/strong\u003e From serial 0L015751\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 5.7L EFI Gen+:\u003c\/strong\u003e From serial 0L010035\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 5.7L Gen+:\u003c\/strong\u003e From serial 0L010037\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 350 MAG MPI Gen+:\u003c\/strong\u003e Including serial range 0L002600–0L309999\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 7.4L MPI:\u003c\/strong\u003e From serial 0L002006\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolvo Penta:\u003c\/strong\u003e 4.3L Gi EFI, 4.3L GL 2-barrel, 5.0L Fi, 5.7L GSi Gen 1+, 5.8L FSi EFI HO, and 7.4L Gi L29\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional marine applications:\u003c\/strong\u003e Selected OMC, Indmar, and Marine Power gasoline engines\u003c\/li\u003e\n\u003cli\u003eAlways confirm the engine model and serial number in the engine owner's manual before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper-core construction:\u003c\/strong\u003e Promotes effective heat dissipation in marine gasoline engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-resistant plating:\u003c\/strong\u003e Trivalent metal plating helps resist corrosion and thread seizure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable insulator:\u003c\/strong\u003e High-strength alumina-silicate ceramic supports reliable ignition performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple-seal design:\u003c\/strong\u003e Helps protect the plug's internal construction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemovable terminal:\u003c\/strong\u003e Supports the applicable marine ignition connection.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplacement and Installation Guidance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eReplace spark plugs according to the engine manufacturer's maintenance schedule or when inspection shows electrode wear, fouling, corrosion, a damaged insulator, or an incorrect gap.\u003c\/li\u003e\n\u003cli\u003eHard starting, ignition misfire, and rough running can indicate that the plugs and ignition system need inspection.\u003c\/li\u003e\n\u003cli\u003eFor engines using multiple plugs, replacing the complete set together helps maintain consistent ignition performance.\u003c\/li\u003e\n\u003cli\u003eCheck the required gap against the engine manufacturer's specification before installation, even when the plugs are supplied pre-gapped for an applicable application.\u003c\/li\u003e\n\u003cli\u003eUse the correct spark-plug socket and follow the engine manufacturer's tightening procedure.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs BPR6EFS compatible with every 3.0L, 4.3L, 5.0L, 5.7L, or 7.4L marine engine?\u003c\/strong\u003e No. Engine generation, ignition system, and serial number can change the required spark plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the reference spark gap?\u003c\/strong\u003e NGK lists 0.8 mm \/ approximately 0.032 in for the applicable marine applications shown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs 816336Q the same plug?\u003c\/strong\u003e Mercury\/Quicksilver 816336Q is the listed OEM reference for the BPR6EFS standard spark plug. Confirm it against the exact engine before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShould the full set be replaced together?\u003c\/strong\u003e For engines using multiple plugs, replacing the complete set together helps keep ignition performance consistent across cylinders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo I need to check the gap before installation?\u003c\/strong\u003e Yes. Confirm the engine manufacturer's required gap before fitting.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest use case:\u003c\/strong\u003e Verified marine gasoline inboard and sterndrive applications that call for NGK BPR6EFS or the 816336Q reference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommon issue:\u003c\/strong\u003e Matching by engine displacement alone can lead to the wrong plug. Generation and serial number are essential for fitment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation reminder:\u003c\/strong\u003e Check the required gap, use the correct socket, and follow the engine manufacturer's tightening procedure.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KIMPEX","offers":[{"title":"Default Title","offer_id":43563816353828,"sku":"901421","price":7.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/eab8a462-591e-49ea-bf80-b6e5541c383f.png?v=1789763784","url":"https:\/\/marisolmarine.com\/products\/kimpex-1","provider":"Marisol Marine Company","version":"1.0","type":"link"}