{"product_id":"ngk-br6fs-spark-plug-4323-ngk-br6fs","title":"NGK BR6FS Spark Plug #4323","description":"\u003cp data-start=\"69\" data-end=\"509\"\u003eThe \u003cstrong data-start=\"73\" data-end=\"86\"\u003eNGK BR6FS\u003c\/strong\u003e is a resistor-equipped marine spark plug engineered for dependable ignition performance in classic carbureted and early electronic-ignition marine engines. Featuring a copper-core center electrode, durable nickel-alloy firing surfaces, and NGK's corrosion-resistant trivalent metal plating, the BR6FS is designed to withstand the demanding operating conditions commonly found in sterndrive and inboard marine applications.\u003c\/p\u003e\n\u003cp data-start=\"511\" data-end=\"783\"\u003eWidely recognized as a direct replacement for the classic \u003cstrong data-start=\"569\" data-end=\"587\"\u003eAC Delco MR43T\u003c\/strong\u003e, the BR6FS has long been used in MerCruiser, Indmar, PCM, Crusader, and other GM-based marine powerplants where reliable cold starts, smooth idle quality, and resistance to fouling are essential.\u003c\/p\u003e\n\u003ch2 data-start=\"785\" data-end=\"804\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"788\" data-end=\"804\"\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"806\" data-end=\"1340\"\u003e\n\u003cli data-start=\"806\" data-end=\"837\"\u003eGenuine NGK marine spark plug\u003c\/li\u003e\n\u003cli data-start=\"838\" data-end=\"866\"\u003eNGK Part Number: \u003cstrong data-start=\"857\" data-end=\"866\"\u003eBR6FS\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"867\" data-end=\"895\"\u003eNGK Stock Number: \u003cstrong data-start=\"887\" data-end=\"895\"\u003e4323\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"896\" data-end=\"965\"\u003eBuilt-in resistor helps suppress radio frequency interference (RFI)\u003c\/li\u003e\n\u003cli data-start=\"966\" data-end=\"1024\"\u003eCopper-core center electrode for excellent heat transfer\u003c\/li\u003e\n\u003cli data-start=\"1025\" data-end=\"1077\"\u003eNickel-alloy firing surfaces for long service life\u003c\/li\u003e\n\u003cli data-start=\"1078\" data-end=\"1123\"\u003eCorrosion-resistant trivalent metal plating\u003c\/li\u003e\n\u003cli data-start=\"1124\" data-end=\"1147\"\u003e14 mm thread diameter\u003c\/li\u003e\n\u003cli data-start=\"1148\" data-end=\"1172\"\u003e11.6 mm (0.460\") reach\u003c\/li\u003e\n\u003cli data-start=\"1173\" data-end=\"1196\"\u003e5\/8\" (16 mm) hex size\u003c\/li\u003e\n\u003cli data-start=\"1197\" data-end=\"1247\"\u003eTapered-seat design (no sealing washer required)\u003c\/li\u003e\n\u003cli data-start=\"1248\" data-end=\"1267\"\u003eHeat Range: \u003cstrong data-start=\"1262\" data-end=\"1267\"\u003e6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1268\" data-end=\"1309\"\u003eFactory preset gap: \u003cstrong data-start=\"1290\" data-end=\"1309\"\u003e0.032\" (0.8 mm)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1310\" data-end=\"1340\"\u003eSolid terminal configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"1342\" data-end=\"1369\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1345\" data-end=\"1369\"\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"1371\" data-end=\"1482\"\u003eCommonly specified for numerous marine gasoline engines requiring \u003cstrong data-start=\"1437\" data-end=\"1450\"\u003eNGK BR6FS\u003c\/strong\u003e or equivalent plugs, including:\u003c\/p\u003e\n\u003ch3 data-start=\"1484\" data-end=\"1527\"\u003eMerCruiser Sterndrive \u0026amp; Inboard Engines\u003c\/h3\u003e\n\u003cul data-start=\"1528\" data-end=\"1714\"\u003e\n\u003cli data-start=\"1528\" data-end=\"1544\"\u003eMerCruiser 140\u003c\/li\u003e\n\u003cli data-start=\"1545\" data-end=\"1562\"\u003eMerCruiser 3.0L\u003c\/li\u003e\n\u003cli data-start=\"1563\" data-end=\"1583\"\u003eMerCruiser 4.3L V6\u003c\/li\u003e\n\u003cli data-start=\"1584\" data-end=\"1604\"\u003eMerCruiser 5.0L V8\u003c\/li\u003e\n\u003cli data-start=\"1605\" data-end=\"1625\"\u003eMerCruiser 5.7L V8\u003c\/li\u003e\n\u003cli data-start=\"1626\" data-end=\"1646\"\u003eMerCruiser 7.4L V8\u003c\/li\u003e\n\u003cli data-start=\"1647\" data-end=\"1714\"\u003eVarious carbureted and early TBI-equipped MerCruiser applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1716\" data-end=\"1745\"\u003eOther Marine Applications\u003c\/h3\u003e\n\u003cul data-start=\"1746\" data-end=\"1981\"\u003e\n\u003cli data-start=\"1746\" data-end=\"1781\"\u003eIndmar carbureted inboard engines\u003c\/li\u003e\n\u003cli data-start=\"1782\" data-end=\"1829\"\u003ePleasurecraft Marine (PCM) carbureted engines\u003c\/li\u003e\n\u003cli data-start=\"1830\" data-end=\"1864\"\u003eCrusader gasoline marine engines\u003c\/li\u003e\n\u003cli data-start=\"1865\" data-end=\"1910\"\u003eLegacy tournament ski and wake boat engines\u003c\/li\u003e\n\u003cli data-start=\"1911\" data-end=\"1981\"\u003eAdditional marine applications specifying AC Delco MR43T equivalents\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1983\" data-end=\"2115\"\u003eAlways verify spark plug requirements using the engine serial number, service manual, or engine specification decal before ordering.\u003c\/p\u003e\n\u003ch2 data-start=\"2117\" data-end=\"2138\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2120\" data-end=\"2138\"\u003eFitment Notice\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2140\" data-end=\"2396\"\u003eSpark plugs should always be matched to the exact engine model and serial number. Even engines with identical displacement may require different heat ranges, electrode designs, or gap settings depending on ignition system configuration and production year.\u003c\/p\u003e\n\u003ch2 data-start=\"2398\" data-end=\"2437\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2401\" data-end=\"2437\"\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2439\" data-end=\"2477\"\u003eReplace spark plugs when experiencing:\u003c\/p\u003e\n\u003cul data-start=\"2479\" data-end=\"2646\"\u003e\n\u003cli data-start=\"2479\" data-end=\"2494\"\u003eHard starting\u003c\/li\u003e\n\u003cli data-start=\"2495\" data-end=\"2507\"\u003eRough idle\u003c\/li\u003e\n\u003cli data-start=\"2508\" data-end=\"2529\"\u003eMisfires under load\u003c\/li\u003e\n\u003cli data-start=\"2530\" data-end=\"2549\"\u003ePoor acceleration\u003c\/li\u003e\n\u003cli data-start=\"2550\" data-end=\"2578\"\u003eIncreased fuel consumption\u003c\/li\u003e\n\u003cli data-start=\"2579\" data-end=\"2595\"\u003eCarbon fouling\u003c\/li\u003e\n\u003cli data-start=\"2596\" data-end=\"2616\"\u003eDamaged electrodes\u003c\/li\u003e\n\u003cli data-start=\"2617\" data-end=\"2646\"\u003eCorrosion or excessive wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2648\" data-end=\"2803\"\u003eMarine engines that spend extended periods trolling, idling, or in seasonal storage should have plugs inspected regularly as part of scheduled maintenance.\u003c\/p\u003e\n\u003ch2 data-start=\"2805\" data-end=\"2830\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2808\" data-end=\"2830\"\u003eInstallation Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2832\" data-end=\"3343\"\u003e\n\u003cli data-start=\"2832\" data-end=\"2912\"\u003eConfirm the required spark plug gap for your exact engine before installation.\u003c\/li\u003e\n\u003cli data-start=\"2913\" data-end=\"3051\"\u003eMany marine ignition systems utilize gap specifications ranging from \u003cstrong data-start=\"2984\" data-end=\"3004\"\u003e0.032\" to 0.045\"\u003c\/strong\u003e depending on engine model and ignition system.\u003c\/li\u003e\n\u003cli data-start=\"3052\" data-end=\"3138\"\u003eInstall into clean cylinder head threads and tighten to manufacturer specifications.\u003c\/li\u003e\n\u003cli data-start=\"3139\" data-end=\"3275\"\u003eNGK's corrosion-resistant plating eliminates the need for anti-seize compound unless specifically required by the engine manufacturer.\u003c\/li\u003e\n\u003cli data-start=\"3276\" data-end=\"3343\"\u003eUse a spark plug socket and torque wrench for final installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3345\" data-end=\"3375\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3348\" data-end=\"3375\"\u003eCross Reference Numbers\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"3377\" data-end=\"3454\"\u003e\n\u003cli data-start=\"3377\" data-end=\"3388\"\u003eNGK BR6FS\u003c\/li\u003e\n\u003cli data-start=\"3389\" data-end=\"3399\"\u003eNGK 4323\u003c\/li\u003e\n\u003cli data-start=\"3400\" data-end=\"3416\"\u003eAC Delco MR43T\u003c\/li\u003e\n\u003cli data-start=\"3417\" data-end=\"3454\"\u003eBR6FS-10 (catalog reference format)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3456\" data-end=\"3481\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3459\" data-end=\"3481\"\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3483\" data-end=\"3852\"\u003eThe BR6FS remains one of the most trusted replacement plugs for classic marine GM-based engines because it combines excellent resistance to fouling with proven durability in high-load boating environments. When replacing plugs, inspect distributor components, ignition wires, and cap\/rotor assemblies at the same time to ensure the ignition system performs at its best.\u003c\/p\u003e\n\u003cp data-start=\"3854\" data-end=\"3923\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"3854\" data-end=\"3867\"\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"WEST","offers":[{"title":"Default Title","offer_id":43564190924836,"sku":"NGK-BR6FS","price":9.66,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/4323-1-500x500.jpg?v=1772747797","url":"https:\/\/marisolmarine.com\/products\/ngk-br6fs-spark-plug-4323-ngk-br6fs","provider":"Marisol Marine Company","version":"1.0","type":"link"}