{"product_id":"ngk-laser-iridium-spark-plugs-for-mercury-optimax-v6-izfr6j-pack-of-6-1-0mm-iridium-platinum","title":"NGK Laser Iridium Spark Plugs for Mercury Optimax V6 (IZFR6J) — Pack of 6, 1.0mm Iridium \u0026 Platinum","description":"\u003cstrong\u003eNGK 4462 Laser Iridium spark plugs (IZFR6J), sold in a 6-pack, are high‑precision replacement plugs engineered for select Mercury Optimax V6 outboard engines to deliver consistent ignition and long service life.\u003c\/strong\u003e\n\n\u003cp\u003eThese NGK Laser Iridium plugs combine a 1.0 mm iridium fine‑wire center electrode with a platinum ground electrode and a 5kΩ resistor to provide dependable combustion and reduced wear in Optimax V6 marine applications. Designed to match OEM dimensions and performance, they replace worn or original equipment plugs on a range of Mercury Optimax models, offering improved longevity and a predictable gap for efficient starting and throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Mercury outboards do these NGK 4462 plugs fit?\u003c\/h3\u003e\n\u003cp\u003eNGK 4462 (IZFR6J) plugs are specified for many Mercury Optimax V6 engines across multiple displacements and model names. Before purchase, cross‑check your engine model and serial year to confirm compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Optimax models including 150XS Pro, DSI 175, Pro XS 175, JP 185, Pro XS 200, 225XS Pro, Sport XS 225, XS 225, 2.5XS 250, Sport XS 250, XS Pro 250, and 250HP variants.\u003c\/li\u003e\n  \u003cli\u003eIntended for 3.0L and 2.5L V6 Optimax configurations listed by Mercury.\u003c\/li\u003e\n  \u003cli\u003eSold as a quantity of six to cover a full V6 cylinder set.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key technical features and dimensions?\u003c\/h3\u003e\n\u003cp\u003eThese plugs follow NGK’s Laser Iridium design for a small, durable center electrode and extended projection to optimize flame travel. They meet OE seat, thread, and reach specifications for direct replacement with reliable electrical resistance and heat range selection.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThread: 14 mm diameter with 1.25 mm pitch and 19 mm reach (3\/4\").\u003c\/li\u003e\n  \u003cli\u003eElectrodes: 1.0 mm iridium center, platinum ground; extended projection fine‑wire design.\u003c\/li\u003e\n  \u003cli\u003eGap: factory set to 0.031\" (0.8 mm); resistor: 5 kΩ; heat range: 6.\u003c\/li\u003e\n  \u003cli\u003eHex size: 5\/8\" (16 mm); terminal: solid; seat type: gasket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these plugs affect performance and maintenance?\u003c\/h3\u003e\n\u003cp\u003eUpgrading or replacing worn plugs with NGK Laser Iridium units helps maintain reliable ignition and consistent combustion, which supports steady starts and smoother operation. Their durable electrode materials resist erosion, extending intervals between changes compared with conventional plugs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIridium fine wire center improves spark focus and longevity versus standard electrodes.\u003c\/li\u003e\n  \u003cli\u003ePlatinum ground electrode enhances wear resistance for stable gaps over time.\u003c\/li\u003e\n  \u003cli\u003eFactory gap and OE fit reduce installation errors and tuning needs.\u003c\/li\u003e\n  \u003cli\u003eTorque specs: cast iron 18–25.3 lb·ft, aluminum 18–21.6 lb·ft for correct installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Boaters, marine technicians, and owners of compatible Mercury Optimax V6 outboards looking for OEM‑grade replacement spark plugs that prioritize durability and consistent ignition. These NGK 4462 plugs suit routine maintenance schedules and those seeking a direct, reliable swap to restore engine starting, throttle response, and combustion stability without altering ignition systems.\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: Are these NGK 4462 plugs a direct replacement for my Optimax V6?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, NGK 4462 (IZFR6J) match OEM dimensions for many Mercury Optimax V6 engines—verify your engine model and serial before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What gap and torque should I use when installing these plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Factory gap is 0.031\" (0.8 mm). Torque: cast iron 18–25.3 lb·ft, aluminum 18–21.6 lb·ft for proper sealing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48080206528670,"sku":"B0GW9JF9QB","price":133.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-4462-front-packaging.jpg?v=1785779780","url":"https:\/\/northtrailauto.ca\/products\/ngk-laser-iridium-spark-plugs-for-mercury-optimax-v6-izfr6j-pack-of-6-1-0mm-iridium-platinum","provider":"North Trail Auto","version":"1.0","type":"link"}