{"product_id":"arco-ig012-mercury-ignition-coil-57-ig012","title":"Arco IG012 Ignition Coil — Mercury Outboard 135–300HP (1998–2006)","description":"\u003ch2\u003eOEM-Grade Ignition Coil for Mercury High-Output Outboards\u003c\/h2\u003e\u003cp\u003eThe Arco IG012 is a direct-fit replacement ignition coil engineered for Mercury high-output outboard engines in the 135HP through 300HP range, covering the 1998 through 2006 production window. This coil is a precision match for the original ignition coil assembly used on these powerful Mercury powerheads and is a reliable choice for restoring strong, consistent spark output.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Outboard 135 HP (1998–2006)\u003c\/li\u003e\n\u003cli\u003eMercury Outboard 200 HP (1998–2006)\u003c\/li\u003e\n\u003cli\u003eMercury Outboard 225 HP (1998–2006)\u003c\/li\u003e\n\u003cli\u003eMercury Outboard 250 HP (1998–2006)\u003c\/li\u003e\n\u003cli\u003eMercury Outboard 300 HP (1998–2006)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces OEM Part Numbers\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury: 339-850227, 339-856991A1\u003c\/li\u003e\n\u003cli\u003eSierra: 18-5187\u003c\/li\u003e\n\u003cli\u003eCDI Electronics: 184-0005\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe IG012 covers the high-output Mercury outboard range from the late 1990s through the mid-2000s — a generation of engines known for strong performance but also for ignition coil failures as they age. It’s the right part to reach for when diagnosing a dead or misfiring cylinder, hard starting, or RPM-related spark dropout on a 135–300HP Mercury from this era. Because Mercury used different coil designs across model years and engine families, always cross-reference your engine’s OEM part number before ordering. For Mercury outboard coil applications from 2004 onward across a broader HP range, compare with the \u003ca href=\"\/products\/arco-ig005-mercury-outboard-ignition-coil\"\u003eArco IG005 Ignition Coil\u003c\/a\u003e. For DFI and EFI Mercury outboard and performance sterndrive coil applications, see the \u003ca href=\"\/products\/arco-ig011-mercury-ignition-coil-57-ig011\"\u003eArco IG011 Ignition Coil\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250813992996,"sku":"57-IG012","price":194.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/57-IG012.jpg?v=1786510591","url":"https:\/\/marisolmarine.com\/products\/arco-ig012-mercury-ignition-coil-57-ig012","provider":"Marisol Marine Company","version":"1.0","type":"link"}