{"product_id":"ngk-iridium-spark-plugs-dcpr7eix-97637-for-harley-davidson-twin-cam-xl-set-of-4-fine-wire-iridium","title":"NGK Iridium Spark Plugs DCPR7EIX (97637) for Harley‑Davidson Twin Cam \u0026 XL — Set of 4, Fine‑Wire Iridium","description":"\u003cp\u003e\u003cstrong\u003eNGK 97637 (formerly 6046) DCPR7EIX iridium spark plugs are a four-piece set designed to deliver reliable ignition performance and long service life for Harley‑Davidson Twin Cam and XL engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese NGK iridium plugs (new part number 97637, superseding 6046) combine NGK's OEM experience with a fine-wire iridium center electrode to support consistent combustion and extended change intervals. NGK is a global leader in spark plug supply, frequently chosen as original equipment, and this specific plug is built to match the heat range and reach requirements common to many Harley‑Davidson Twin Cam and Sportster (XL) applications. This listing contains four spark plugs—enough for a four-cylinder application or a spare set for two cylinders—sold new and ready for install.\u003c\/p\u003e\n\n\u003ch3\u003eWill these NGK iridium plugs fit my Harley‑Davidson Twin Cam or XL?\u003c\/h3\u003e\n\n\u003cp\u003eCompatibility depends on model year and engine variant, but the DCPR7EIX (NGK 97637, formerly 6046) is widely used in many Twin Cam and select XL (Sportster) engines. Always cross‑reference your motorcycle's factory service manual or parts diagram for plug type, thread reach, and torque specifications before purchase.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePart number: NGK 97637 (supersedes 6046)\u003c\/li\u003e\n  \u003cli\u003eType: DCPR7EIX — iridium fine wire center electrode\u003c\/li\u003e\n  \u003cli\u003eSold as a set of four spark plugs\u003c\/li\u003e\n  \u003cli\u003eConfirm thread reach and gap with OEM specs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the iridium construction benefit everyday riding?\u003c\/h3\u003e\n\n\u003cp\u003eIridium center electrodes have a very fine tip that promotes a more focused spark, which helps with smooth starts, stable idle, and consistent combustion across throttle ranges. That benefit typically results in longer service intervals compared with standard nickel plugs while maintaining reliable ignition under varied riding conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFine-wire iridium provides concentrated spark energy\u003c\/li\u003e\n  \u003cli\u003eImproved ignition stability at low and high rpm\u003c\/li\u003e\n  \u003cli\u003eExtended service life versus conventional plugs\u003c\/li\u003e\n  \u003cli\u003eReduced misfire potential under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know about installation and maintenance?\u003c\/h3\u003e\n\n\u003cp\u003eInstall these plugs using the correct torque and a properly gapped electrode as specified in your motorcycle's manual. Use a torque wrench to avoid over-tightening and check plug condition periodically—electrode wear, deposits, or unusual coloring indicate tuning or mechanical issues that may need attention.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eSet gap to OEM specification before installation\u003c\/li\u003e\n  \u003cli\u003eTighten to manufacturer torque values to protect threads\u003c\/li\u003e\n  \u003cli\u003eInspect plugs during routine service intervals\u003c\/li\u003e\n  \u003cli\u003eReplace in matched sets for multi-cylinder engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose NGK DCPR7EIX instead of a generic plug?\u003c\/h3\u003e\n\n\u003cp\u003eNGK is one of the largest OEM spark plug suppliers worldwide, and their part designs are engineered to meet or exceed factory tolerances. The DCPR7EIX offers a proven heat range and electrode geometry suited to many Harley applications, which helps preserve engine performance and reliability compared with off-brand or incorrectly specified plugs.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOEM-level manufacturing and quality control\u003c\/li\u003e\n  \u003cli\u003eAccurate heat range and electrode reach for compatibility\u003c\/li\u003e\n  \u003cli\u003eIridium tip for longer life and consistent spark\u003c\/li\u003e\n  \u003cli\u003eSold in a convenient four-plug pack\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? This four-pack of NGK 97637 (6046) DCPR7EIX iridium spark plugs is aimed at Harley‑Davidson owners, mechanics, and enthusiasts who want OEM-grade replacement plugs for Twin Cam and certain XL engines. If you prioritize reliable ignition, longer service intervals, and a direct-fit NGK part number that supersedes 6046, this set is a practical upgrade or routine maintenance purchase. Always verify fitment against your specific model year and engine specifications before ordering.\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: Does NGK 97637 replace the old 6046 part number?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. NGK 97637 is the current number that supersedes 6046 for the DCPR7EIX plug.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many plugs are included in this listing?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This listing contains four new NGK DCPR7EIX (97637) spark plugs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48086759473310,"sku":"B00MG79MX6","price":64.97,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-97637-front-packaging.jpg?v=1785903788","url":"https:\/\/northtrailauto.ca\/products\/ngk-iridium-spark-plugs-dcpr7eix-97637-for-harley-davidson-twin-cam-xl-set-of-4-fine-wire-iridium","provider":"North Trail Auto","version":"1.0","type":"link"}