{"product_id":"ngk-iridium-ix-spark-plugs-for-harley-davidson-twin-cam-1999-2016-pair-pre-gapped-long-life","title":"NGK Iridium IX spark plugs for Harley-Davidson Twin Cam (1999-2016) — Pair, Pre-gapped, Long-life","description":"\u003cp\u003e\u003cstrong\u003eNGK Iridium IX DCPR7EIX spark plugs are high-performance, pre-gapped iridium plugs engineered to improve ignition consistency and durability in 1999–2016 Harley-Davidson Twin Cam engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese NGK Iridium IX plugs use a fine iridium center electrode and advanced plating to lower ignition voltage requirements, resist corrosion, and provide reliable sparks under heavy loads. Designed as direct-fit replacements for many Twin Cam models, they arrive pre-gapped for straightforward installation and aim to stabilize combustion for crisper throttle response and longer service intervals compared with older nickel-type plugs.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these plugs affect throttle response and power delivery?\u003c\/h3\u003e\n\u003cp\u003eSmaller-diameter iridium electrodes concentrate the spark energy, which can produce more consistent ignition across the combustion cycle. That consistency helps the engine burn fuel more completely, often translating to smoother throttle transitions and improved mid-range pull on compatible setups.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUltra-fine iridium center electrode for focused spark\u003c\/li\u003e\n  \u003cli\u003eLower required ignition voltage reduces misfires at high demand\u003c\/li\u003e\n  \u003cli\u003eConsistent firing across cylinders improves throttle feel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these NGK plugs easy to install on Twin Cam Harleys?\u003c\/h3\u003e\n\u003cp\u003eYes — the DCPR7EIX plugs are made as direct replacements and come pre-gapped to NGK specifications, so most installations require only basic tools. Follow correct torque specs and use anti-seize sparingly on the threads if recommended by your manual to ensure proper seating and future removal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-gapped for typical Twin Cam settings\u003c\/li\u003e\n  \u003cli\u003eStandard thread and seat dimensions for direct fitment\u003c\/li\u003e\n  \u003cli\u003eFits 1999–2016 Harley-Davidson Twin Cam applications (verify model compatibility)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes NGK Iridium IX different from conventional plugs?\u003c\/h3\u003e\n\u003cp\u003eIridium electrode material is significantly harder and finer than nickel, allowing a much smaller tip that maintains a strong, concentrated spark over time. NGK also applies improved metal shell plating for enhanced corrosion resistance and longer-lasting electrical performance in vibration-prone motorcycle use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e25% smaller than typical platinum electrodes, far smaller than nickel tips\u003c\/li\u003e\n  \u003cli\u003eDurable iridium resists wear and preserves spark geometry\u003c\/li\u003e\n  \u003cli\u003eAdvanced shell plating reduces corrosion and eases removal later\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long can I expect these plugs to last and when should I inspect them?\u003c\/h3\u003e\n\u003cp\u003eLongevity depends on riding style, fuel quality, and engine tuning, but iridium plugs generally outlast standard nickel plugs in everyday and spirited riding. Inspect plugs during scheduled maintenance intervals or when you notice rough idling, hesitation, or hard starting.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for extended service life compared with nickel electrodes\u003c\/li\u003e\n  \u003cli\u003eCheck plugs at regular tune-up intervals or every few thousand miles\u003c\/li\u003e\n  \u003cli\u003eLook for consistent electrode shape and minimal deposit buildup\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Riders of 1999–2016 Harley-Davidson Twin Cam motorcycles who want a durable, direct-fit replacement spark plug that emphasizes ignition consistency, corrosion resistance, and simpler installation. These NGK Iridium IX DCPR7EIX plugs suit daily commuters, long-distance tourers, and enthusiasts who want reliable spark performance without changing ignition hardware.\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: Will these fit my 2005 Harley Twin Cam?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, DCPR7EIX plugs are compatible with many 1999–2016 Twin Cam models; verify your owner's manual or part cross-reference for exact fit.\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: Yes, NGK Iridium IX DCPR7EIX plugs arrive pre-gapped to NGK specifications for typical Twin Cam applications.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48087368138910,"sku":"B003BUCNNS","price":37.17,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-iridium-ix-front-packaging_a90aaf76-de3a-4300-9887-8cd401b54e89.jpg?v=1785922007","url":"https:\/\/northtrailauto.ca\/products\/ngk-iridium-ix-spark-plugs-for-harley-davidson-twin-cam-1999-2016-pair-pre-gapped-long-life","provider":"North Trail Auto","version":"1.0","type":"link"}