{"product_id":"ngk-lfr4a-e-standard-marine-spark-plug-copper-core-5-8-inch-hex","title":"NGK LFR4A-E Standard Marine Spark Plug, Copper Core, 5\/8 Inch Hex","description":"\u003cp\u003eThe NGK LFR4A-E is a standard marine spark plug built on NGK's proven copper-core design, giving boat owners a reliable, factory-style replacement plug for scheduled engine maintenance. A solid copper core runs through the center electrode to provide strong heat dissipation and conductivity across a broad heat range, while corrosion-resistant plating on the shell and threads keeps installation and removal easy even after time in a marine environment. The plug uses a semi-surface discharge ground configuration with a nickel ground electrode and a nickel center electrode tip, and it carries a 5\/8 inch hex size for use with common spark plug sockets. Internally, NGK builds this plug with a pure alumina silicate ceramic insulator for strength and heat transfer, and a ribbed suppressor seal along with a triple seal to resist spark flashover, misfire, and leakage. NGK rates the plug at 10k ohm resistance for suppression of ignition interference. As with any spark plug, always confirm this is the correct plug called for in your engine's owner or maintenance manual before installing, since using the wrong plug can reduce performance and fuel economy or cause engine damage. Replacing spark plugs on schedule, rather than cleaning and reusing old ones, helps maintain consistent starting and running performance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e NGK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e LFR4A-E\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Standard Spark Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e 10k Ohm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Configuration:\u003c\/strong\u003e Semi-Surface Discharge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Electrode Core Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Core Material:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Tip Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex Size:\u003c\/strong\u003e 5\/8 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 087295164990\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the NGK LFR4A-E spark plug used for?\u003c\/strong\u003e The NGK LFR4A-E is a standard marine spark plug used to replace worn spark plugs during routine engine maintenance on inboard, sterndrive, or outboard marine engines that call for this plug in their owner or maintenance manual.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat electrode material does the LFR4A-E use?\u003c\/strong\u003e This NGK plug has a copper center electrode core with a nickel center electrode tip and a nickel ground electrode, paired with a solid copper core for heat dissipation and conductivity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat hex size wrench does the LFR4A-E spark plug need?\u003c\/strong\u003e The NGK LFR4A-E has a 5\/8 inch hex size, so it can be installed and removed with a standard 5\/8 inch spark plug socket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the resistance rating of the LFR4A-E?\u003c\/strong\u003e The NGK LFR4A-E carries a 10k ohm resistance rating, which helps suppress ignition interference.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the LFR4A-E an iridium or standard spark plug?\u003c\/strong\u003e The LFR4A-E is one of NGK's standard spark plugs, using a copper core and nickel electrode materials rather than an iridium-tipped design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat ground electrode configuration does this plug use?\u003c\/strong\u003e The NGK LFR4A-E uses a semi-surface discharge ground configuration with a nickel ground electrode.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the NGK LFR4A-E spark plug weigh?\u003c\/strong\u003e The NGK LFR4A-E weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the LFR4A-E plug sealed against leakage?\u003c\/strong\u003e NGK builds the LFR4A-E with a ribbed suppressor seal and a triple seal to resist spark flashover, misfire, and leakage at the plug boot.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I clean and reuse my old spark plug instead of buying an LFR4A-E?\u003c\/strong\u003e No, NGK recommends replacing worn plugs with a new plug like the LFR4A-E rather than cleaning and reusing old ones, since a new plug provides more consistent performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the LFR4A-E is the right plug for my engine?\u003c\/strong\u003e Check your engine's owner or maintenance manual for the exact spark plug it specifies before installing an NGK LFR4A-E, since using the wrong plug can reduce performance, reduce fuel economy, or cause engine damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat insulator material is used in the LFR4A-E?\u003c\/strong\u003e The NGK LFR4A-E uses a pure alumina silicate ceramic insulator, which provides strength, reduces breakage, and improves heat transfer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the NGK LFR4A-E a genuine NGK part?\u003c\/strong\u003e Yes, the LFR4A-E is a genuine NGK standard spark plug, part number LFR4A-E.\u003c\/p\u003e","brand":"NGK Spark Plugs","offers":[{"title":"Default Title","offer_id":49028254695643,"sku":"NGK-LFR4A-E","price":9.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/NGK-LFR4A-E-Spark-Plug__04738.1722498309.500.750.jpg?v=1785165238","url":"https:\/\/www.goodvibesmarina.com\/products\/ngk-lfr4a-e-standard-marine-spark-plug-copper-core-5-8-inch-hex","provider":"Good Vibes Marina","version":"1.0","type":"link"}