{"product_id":"ngk-lkr6e-9n-spark-plug-4-pack-12mm-thread-26-5mm-reach-copper-core-for-small-engines","title":"NGK LKR6E-9N Spark Plug 4-Pack — 12mm Thread, 26.5mm Reach, Copper Core for Small Engines","description":"\u003cp\u003e\u003cstrong\u003eNGK 90410 LKR6E-9N spark plug 4-pack is a standard OEM-style ignition plug built with a copper core, alumina-silicate insulator, and trivalent metal plating for dependable performance and corrosion resistance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis four-pack of NGK 90410 (LKR6E-9N) plugs is designed to deliver consistent ignition and long life in compatible engines. Each plug combines materials and engineering features—corrugated ribs, triple seals, and a copper heat-sinking core—to reduce misfires, prevent leakage, and help maintain stable combustion behavior across normal operating conditions. The plugs use a 12mm thread with a gasket seat, a 26.5mm reach, and a factory-set 0.035\" (0.9mm) gap, making them a straightforward replacement in many small-displacement engines and OEM applications.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this spark plug improve reliability during daily driving?\u003c\/h3\u003e\n\u003cp\u003eThe NGK 90410 focuses on durability and consistent spark delivery rather than exotic tip materials. Trivalent metal plating resists corrosion and seizing, while a copper core helps move heat away from the firing end to stabilize temperature. Corrugated ribs on the ceramic reduce the chance of flashover along the insulator surface.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTrivalent plating minimizes thread corrosion and makes removal easier.\u003c\/li\u003e\n  \u003cli\u003eCopper core promotes steady heat dissipation under varied loads.\u003c\/li\u003e\n  \u003cli\u003eCorrugated insulator ribs lower flashover risk in damp or fouled conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs fit my vehicle and what are their key specs?\u003c\/h3\u003e\n\u003cp\u003eThese plugs use a 12mm thread diameter, a 26.5mm (1.04\") reach, and a gasket (seated) configuration—common in many motorcycles, ATVs, small engines, and some older cars. They have a 5 kΩ resistor to reduce radio interference and a standard hex size for typical socket tools.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThread size: 12mm; seat type: gasket (seated).\u003c\/li\u003e\n  \u003cli\u003eReach: 26.5mm (1.04\"); hex: 5\/8\" (16mm).\u003c\/li\u003e\n  \u003cli\u003eResistance: 5 kΩ; factory gap: 0.035\" (0.9mm); terminal: solid.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do the materials and construction affect maintenance and lifespan?\u003c\/h3\u003e\n\u003cp\u003eMaterials and construction choices prioritize serviceability and steady performance. The alumina-silicate ceramic insulator offers mechanical strength and effective heat transfer, while triple sealing prevents combustion gases or moisture from entering the plug body. These design elements collectively reduce the frequency of issues like fouling and make removal and reinstallation simpler.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePure alumina-silicate ceramic for thermal stability and durability.\u003c\/li\u003e\n  \u003cli\u003eTriple seals protect internal components from leakage and contaminants.\u003c\/li\u003e\n  \u003cli\u003eTrivalent plating reduces galling on the threads for easier servicing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use and gap these plugs for best results?\u003c\/h3\u003e\n\u003cp\u003eNGK ships these plugs with a 0.035\" (0.9mm) plug gap suitable for a wide range of compatible engines. Always confirm the correct gap and thread reach against your vehicle’s service manual—adjust or replace only as recommended. Tighten to the manufacturer torque spec and inspect threads and seat surfaces during installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFactory gap: 0.035\" (0.9mm); verify and adjust if your engine requires a different setting.\u003c\/li\u003e\n  \u003cli\u003eConfirm thread reach and seat type before installation to avoid engine damage.\u003c\/li\u003e\n  \u003cli\u003eUse proper torque and inspect seals and threads during replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The NGK 90410 LKR6E-9N 4-pack is aimed at technicians, DIY mechanics, and riders who need a reliable, service-friendly standard plug for motorcycles, scooters, small-displacement engines, and certain OEM applications. Choose these plugs if you want proven materials—copper core, robust ceramic insulator, and anti-corrosion plating—designed for steady ignition, straightforward maintenance, and compatibility with engines that require a 12mm, 26.5mm-reach gasket-seat spark plug.\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 NGK 90410 plugs pre-gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, they ship with a factory gap of 0.035\" (0.9mm). Verify and adjust if your engine specifies a different gap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What thread and seat type do these plugs use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They use a 12mm thread with a gasket (seated) type and a 26.5mm (1.04\") reach—confirm fit before installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48083177570462,"sku":"B081DQ73X8","price":53.15,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-90410-spark-plug-front-view.jpg?v=1785827790","url":"https:\/\/northtrailauto.ca\/products\/ngk-lkr6e-9n-spark-plug-4-pack-12mm-thread-26-5mm-reach-copper-core-for-small-engines","provider":"North Trail Auto","version":"1.0","type":"link"}