{"product_id":"moto1988-ignition-coil-spark-plug-kit-for-honda-trx400ex-1999-2006-oem-fit-improved-starting","title":"MOTO1988 Ignition Coil \u0026 Spark Plug Kit for Honda TRX400EX 1999-2006 — OEM Fit, Improved Starting","description":"\u003cp\u003e\u003cstrong\u003eThis MOTO1988 ignition coil and spark plug kit replaces Honda OEM 30500-HN1-003 to restore reliable spark on Sportrax 400 TRX400EX models from 1999 through 2006.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your Honda TRX400EX is showing weak starts, rough idle, or misfires, a worn ignition coil or fouled spark plug is often the cause. This package contains one ignition coil and one spark plug designed to fit the Sportrax 400 TRX400EX 2x4 across model years 1999–2006, making it a straightforward service part for routine tune-ups or troubleshooting ignition issues.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this coil and plug improve my ATV's starting and idle?\u003c\/h3\u003e\n\u003cp\u003eReplacing an old ignition coil and plug can deliver a stronger, more consistent spark, which helps the engine start faster and maintain a steadier idle. The kit matches the OEM part number to ensure electrical and mounting compatibility with the TRX400EX.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect OEM compatibility: 30500-HN1-003 fitment reduces installation guesswork.\u003c\/li\u003e\n  \u003cli\u003eStronger spark output improves combustion efficiency and throttle response.\u003c\/li\u003e\n  \u003cli\u003eOne-coil, one-plug package for a targeted, budget-friendly repair.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this part fit my specific TRX400EX year and model?\u003c\/h3\u003e\n\u003cp\u003eThis ignition coil and spark plug are intended for the Honda Sportrax 400 TRX400EX 2x4 from 1999 through 2006. Double-check your machine’s model year and OEM part number to confirm fit before purchasing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirmed coverage: TRX400EX 2x4 model years 1999–2006.\u003c\/li\u003e\n  \u003cli\u003eOEM reference included: 30500-HN1-003 to match service manuals and parts diagrams.\u003c\/li\u003e\n  \u003cli\u003eCheck photos and listing details if your machine has aftermarket modifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eInstallation is typically plug-and-play for stock TRX400EX wiring and mounts but basic mechanical skills and hand tools are recommended. Inspect connectors and wiring for corrosion and ensure proper spark plug gap per Honda specifications before final assembly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSimple replacement: bolt-on coil and standard spark plug thread and gap.\u003c\/li\u003e\n  \u003cli\u003eVerify spark plug gap and torque to OEM values for reliable performance.\u003c\/li\u003e\n  \u003cli\u003eInspect ignition wiring harness and replace any damaged clips or boots when servicing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat after-sales support and purchase tips are provided?\u003c\/h3\u003e\n\u003cp\u003eMOTO1988 advises buyers to confirm model fit with the applicable years and OEM number shown in the listing. If you encounter any issues during purchase or installation, customer support is available by email to assist with troubleshooting or warranty-related questions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTip: Compare the OEM number 30500-HN1-003 with your existing coil before ordering.\u003c\/li\u003e\n  \u003cli\u003eSupport: Contact MOTO1988 via email for help with fitment or product concerns.\u003c\/li\u003e\n  \u003cli\u003ePackaging: Kit includes 1 ignition coil and 1 spark plug for a focused repair.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? This kit is intended for owners and mechanics of Honda Sportrax 400 TRX400EX 2x4 ATVs (1999–2006) who need a direct-replacement ignition coil and spark plug for routine maintenance, diagnosis of ignition-related issues, or restoring reliable starting and engine smoothness. It’s also suitable for riders performing a single-cylinder ignition refresh without buying a larger parts bundle.\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 this kit match Honda OEM part 30500-HN1-003?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the kit is listed as compatible with OEM number 30500-HN1-003 for TRX400EX 1999–2006.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this an installation-ready replacement?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the coil and plug are direct replacements for stock TRX400EX units; basic tools and checking plug gap are recommended.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"MOTO1988","offers":[{"title":"Default Title","offer_id":48084527579294,"sku":"B09PL5FC18","price":29.73,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/moto1988-ignition-coil-front-view_0ddbf51e-43bd-4b2a-bca6-7bd7e60402b4.jpg?v=1785858438","url":"https:\/\/northtrailauto.ca\/products\/moto1988-ignition-coil-spark-plug-kit-for-honda-trx400ex-1999-2006-oem-fit-improved-starting","provider":"North Trail Auto","version":"1.0","type":"link"}