{"product_id":"champion-l77jc4-821-marine-spark-plug-for-evinrude-outboard-engines","title":"Champion L77JC4 (821) Marine Spark Plug for Evinrude Outboard Engines","description":"\u003cp\u003eThe Champion L77JC4 is a marine spark plug built as a quality OEM replacement for Evinrude outboard engines. It uses a copper core center electrode that increases conductivity and gives precise control of heat range, helping the plug resist fouling and overheating under sustained heavy engine loads that marine outboards regularly see on the water.\u003c\/p\u003e\u003cp\u003eBeyond the copper core electrode, the L77JC4 is engineered for superior corrosion resistance, which matters in the salt and fresh water environments outboard engines operate in. Champion identifies this plug internally as Spark Plug #821, and it carries a 14mm thread size with a metal top material for a secure, standard fit in compatible cylinder heads. Each unit is sold as a single spark plug, making it easy to order the exact quantity needed for a full engine service or a single-cylinder replacement.\u003c\/p\u003e\u003cp\u003eThis spark plug is intended for Evinrude outboard engines and is delivered ready to install with no additional assembly required. Buyers replacing worn, fouled, or corroded plugs on their outboard can use the L77JC4 as a direct, dependable replacement that matches Champion's proven performance and durability standards.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Champion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e L77JC4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChampion Spark Plug Number:\u003c\/strong\u003e 821\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 037551000678\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Material:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Material Type:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 14mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 spark plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Champion L77JC4 spark plug fit?\u003c\/strong\u003e The Champion L77JC4 (Champion Spark Plug #821) is designed for Evinrude outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the L77JC4 the same as Champion spark plug 821?\u003c\/strong\u003e Yes, L77JC4 is the public part number for the Champion Spark Plug #821 -- it is the same spark plug listed under Champion's internal number 821.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the thread size on this spark plug?\u003c\/strong\u003e The Champion L77JC4 has a 14mm thread size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the electrode made of?\u003c\/strong\u003e The center electrode on the Champion L77JC4 uses a copper core, which improves conductivity and gives more precise control of heat range for better overall wear.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Champion L77JC4 spark plug weigh?\u003c\/strong\u003e This spark plug weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many spark plugs come in one order?\u003c\/strong\u003e Each order of the Champion L77JC4 includes one spark plug.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Champion spark plug or an aftermarket copy?\u003c\/strong\u003e The L77JC4 is a genuine Champion marine spark plug, manufactured by Champion under their own Spark Plug #821 designation, not a third-party aftermarket copy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the L77JC4 resist fouling and corrosion?\u003c\/strong\u003e Yes, the Champion L77JC4 is built with superior corrosion resistance and is designed to resist fouling, which is important for marine outboard engines exposed to water and heavy loads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the top material of the L77JC4 spark plug?\u003c\/strong\u003e The top material of the Champion L77JC4 is metal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the L77JC4 handle heavy engine loads?\u003c\/strong\u003e The Champion L77JC4 is specifically designed to resist overheating under heavy engine loads, making it suitable for sustained outboard use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any tools or additional parts to install the L77JC4?\u003c\/strong\u003e The Champion L77JC4 is a direct-fit spark plug for Evinrude outboard engines and requires only a standard spark plug socket for installation; no additional parts are included or needed.\u003c\/p\u003e","brand":"Champion Spark Plugs","offers":[{"title":"Default Title","offer_id":49027462430939,"sku":"CHA-L77JC4","price":2.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/L77JC4__51911.1722504842.500.750.jpg?v=1785163548","url":"https:\/\/www.goodvibesmarina.com\/products\/champion-l77jc4-821-marine-spark-plug-for-evinrude-outboard-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}