{"product_id":"champion-copper-marine-spark-plugs-pack-of-4-ql77jc4-14mm-thread-12-7mm-reach-copper-core","title":"Champion Copper Marine Spark Plugs Pack of 4 — QL77JC4 14mm Thread, 12.7mm Reach, Copper-Core","description":"\u003cp\u003e\u003cstrong\u003eChampion 828M QL77JC4 spark plugs are a pack of four copper-core marine\/utility plugs designed as OEM replacements with 14mm threads, 12.7mm reach, and a flat-seat, solid-terminal design.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese Champion copper-plus spark plugs (Genuine OEM Replacement Part # QL77JC4-4PK) are built for small engines and many marine applications where a reliable, cost-effective ignition component is needed. Supplied in bulk packaging, each plug features a copper-core electrode that balances conductivity and heat control for predictable performance and wear life. Always check your engine owner's manual or the compatibility list before installation to confirm fitment and correct gap settings.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these spark plugs differ from iridium or platinum options?\u003c\/h3\u003e\n\u003cp\u003eChampion copper-plus plugs use a copper core electrode rather than precious metal tips, which gives strong electrical conductivity and efficient heat transfer. They are typically more affordable and are suitable where manufacturers specify a standard copper electrode.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper-core electrode for excellent conductivity and heat control\u003c\/li\u003e\n  \u003cli\u003eNon-projected tip and flat seat as specified by OEM number QL77JC4\u003c\/li\u003e\n  \u003cli\u003eLess expensive than iridium\/platinum but with shorter top-end lifespan\u003c\/li\u003e\n  \u003cli\u003eIdeal for routine service and many small-engine or marine OEM applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the exact specifications I need to know before buying?\u003c\/h3\u003e\n\u003cp\u003eKey dimensions and design details determine whether these plugs fit your engine. This four-pack includes plugs with 14mm thread diameter, 12.7mm (0.5\") reach, 21mm hex, flat-seat, and a solid terminal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThread diameter: 14 mm\u003c\/li\u003e\n  \u003cli\u003eReach (thread length): 12.7 mm (0.5\")\u003c\/li\u003e\n  \u003cli\u003eHex size: 21 mm for socket removal\/installation\u003c\/li\u003e\n  \u003cli\u003eSeat type: flat seat; Tip configuration: non-projected; Terminal: solid\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I install and maintain these Champion plugs for best results?\u003c\/h3\u003e\n\u003cp\u003eFollow your engine manufacturer’s torque specs and gap recommendations; improper installation can cause misfires or engine damage. Because these are bulk-packed new parts, inspect each plug, set the correct gap if needed, and torque to the engine’s recommended value during installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify OEM part number QL77JC4-4PK matches your engine manual\u003c\/li\u003e\n  \u003cli\u003eCheck and adjust electrode gap per manufacturer recommendations\u003c\/li\u003e\n  \u003cli\u003eTighten to specified torque using a 21mm socket — avoid over-tightening\u003c\/li\u003e\n  \u003cli\u003eReplace plugs in matching intervals and inspect for fouling or wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich engines and situations are these Champion plugs compatible with?\u003c\/h3\u003e\n\u003cp\u003eThese are standard-type spark plugs widely used in small engines, certain marine outboards, lawn and garden equipment, and other OEM-specified applications. Compatibility varies by make and model, so refer to your owner’s manual or the provided compatibility list to confirm fit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned as genuine OEM replacement (part # QL77JC4-4PK)\u003c\/li\u003e\n  \u003cli\u003eCommon in small engines and many marine\/utility applications\u003c\/li\u003e\n  \u003cli\u003eSold as a pack of four — convenient for multi-cylinder service\u003c\/li\u003e\n  \u003cli\u003eBulk-packed, new condition — verify part number before purchase\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Technicians, DIYers, and fleet maintainers who need an economical, OEM-specified spark plug for marine or small-engine service will find this Champion 4-pack useful. Choose these plugs when your engine manual lists the QL77JC4 part number or when a 14mm thread, 12.7mm reach, flat seat, and solid-terminal copper-core plug are required. Always consult your equipment manual for correct identification and installation procedures to ensure safe, reliable operation.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this Champion plug the exact OEM replacement?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — this is a genuine OEM replacement pack labeled QL77JC4-4PK; verify your engine manual for compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these plugs come pre-gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are new and bulk-packed; check and set the gap to your manufacturer’s specification before installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Champion","offers":[{"title":"Default Title","offer_id":67592556708025,"sku":"B01GTXU5GU","price":60.01,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/champion-ql77jc4-front-packaging.jpg?v=1790565533","url":"https:\/\/redleafauto.ca\/products\/champion-copper-marine-spark-plugs-pack-of-4-ql77jc4-14mm-thread-12-7mm-reach-copper-core","provider":"Redleaf Auto","version":"1.0","type":"link"}