{"product_id":"wlfinkmo-ignition-coil-for-mercury-optimax-pro-xs-75-250-hp-single-unit-direct-replacement","title":"WLFINKMO Ignition Coil for Mercury Optimax \u0026 Pro XS 75–250 HP — Single Unit Direct Replacement","description":"\u003cstrong\u003eWLFINKMO ignition coil for Mercury Optimax and EFI outboards delivers a high-intensity spark designed to restore reliable starting and steady throttle response.\u003c\/strong\u003e\n\nThis replacement ignition coil fits a wide range of Mercury Marine Optimax, Pro XS, Racing and EFI 2- and 4-stroke engines, including popular HP ranges from 30 up to 300 depending on model. Built to replace OEM part numbers like 300-879984T01, 300-8M0077471 and 339-879984A1, this coil is intended as a direct swap to revive ignition performance without complex rewiring. It comes as a single unit and is aimed at owners and technicians who need a straightforward, cost-effective ignition component for common Mercury outboard platforms.\n\n\u003ch3\u003eWhich Mercury engines will this coil fit?\u003c\/h3\u003e\n\u003cp\u003eThis coil is compatible with many Mercury Optimax, Pro XS, Racing and EFI models across 2- and 4-stroke families. Check your engine's model and the OEM replacement numbers before ordering to confirm fitment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOptimax: 75, 90, 115, 125, 175, 200, 225, 250 HP ranges\u003c\/li\u003e\n  \u003cli\u003ePro XS\/Pro: 115 Pro, 175 Pro, 200 Pro, 225 Pro, 250 Pro\u003c\/li\u003e\n  \u003cli\u003eRacing and Sport XS: 225 XS, 225 Sport XS, 250 XS, 250 Sport XS, 300 XS\u003c\/li\u003e\n  \u003cli\u003eEFI 4-stroke: 30, 40, 50, 60 HP and EFI 2-stroke: 150–250 models noted\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this ignition coil affect starting and performance?\u003c\/h3\u003e\n\u003cp\u003eThe coil delivers increased ignition energy and faster spark recovery compared with a worn stock coil, which helps engines start more readily and maintain smoother acceleration. It doesn’t change engine tuning but supports more consistent combustion when paired with properly functioning fuel and ignition systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigher intensity spark for improved ignition of the air\/fuel mix\u003c\/li\u003e\n  \u003cli\u003eFaster response reduces misfires and hesitation under load\u003c\/li\u003e\n  \u003cli\u003eDirect replacement avoids modifying existing wiring or mounts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs installation difficult and what comes in the package?\u003c\/h3\u003e\n\u003cp\u003eInstallation is intended to be a simple replacement of the existing coil unit—no additional parts are included or usually required. The package contains one ignition coil; reuse of existing fasteners and connectors is typical, but inspect mounting hardware and boots for wear during replacement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePackage includes: 1 ignition coil (single unit)\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM numbers such as 300-879984T01 and 339-879984A1\u003c\/li\u003e\n  \u003cli\u003eInstallers should verify connector compatibility and torque specs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should you check before buying a replacement coil?\u003c\/h3\u003e\n\u003cp\u003eConfirming engine compatibility and OEM replacement numbers is the most important step to avoid returns. Also inspect related ignition components—spark plugs, boots, wiring and the stator—because old or damaged parts can mask performance issues even after installing a new coil.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMatch part numbers: 300-8M0077471, 879984T01, 339-879984T00, etc.\u003c\/li\u003e\n  \u003cli\u003eInspect spark plugs and ignition leads for wear or corrosion\u003c\/li\u003e\n  \u003cli\u003eConfirm mounting points and connector style before installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for\n\nThis WLFINKMO ignition coil is aimed at boat owners, marine technicians and performance tuners working with Mercury Optimax, Pro XS and EFI outboards who need a reliable, plug-and-play replacement. It’s useful when diagnosing tough starting, intermittent misfires or weak throttle response so long as the rest of the ignition and fuel systems are in good condition. If you require an exact fit, cross-check your engine model and OEM numbers listed in the product description before purchase to ensure compatibility.\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 coil replace OEM 300-879984T01?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This WLFINKMO coil is listed as a replacement for 300-879984T01 and several related OEM numbers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will I need extra parts to install it?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Usually no. The unit is a direct replacement, but inspect and possibly reuse existing boots, fasteners and wiring.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"WLFINKMO","offers":[{"title":"Default Title","offer_id":48082946654366,"sku":"B08C2BXTHP","price":51.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/wlfinkmo-ignition-coil-front-view.jpg?v=1785819975","url":"https:\/\/northtrailauto.ca\/products\/wlfinkmo-ignition-coil-for-mercury-optimax-pro-xs-75-250-hp-single-unit-direct-replacement","provider":"North Trail Auto","version":"1.0","type":"link"}