{"product_id":"spark-plug-ignition-coil-wire-set-for-mercruiser-120-140-2-5l-3-0l","title":"Spark Plug Ignition Coil Wire Set for Mercruiser 120 140 2.5L 3.0L","description":"\u003cp\u003eIn this review of the Spark Plug Ignition Coil Wire Set for Mercruiser 120 140 2.5L and 3.0L engines, the bottom line is simple: this kit is for boat owners and DIY marine technicians who need a direct-fit replacement wiring set that restores consistent spark delivery. The reviewer found the set to be well matched to the specified Mercruiser sterndrive applications and appreciated that the wires use stainless steel conductors and silicone insulation for heat resistance. Its clear compatibility list and the included variety of wire lengths make it a straightforward swap when the original wires wear out.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect fit replacement:\u003c\/strong\u003e The set replaces Mercruiser OEM numbers and common equivalents so it fits specified 120 and 140 sterndrive engines without modification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-temperature protection:\u003c\/strong\u003e Silicone insulation provides reliable resistance to engine bay heat, helping maintain spark integrity under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable conductors:\u003c\/strong\u003e Stainless steel conductor cores offer consistent signal transfer for more reliable ignition performance over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete wire assortment:\u003c\/strong\u003e The kit includes five wires in staggered lengths to match factory routing and cylinder positions on 4-cylinder sterndrive engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-reference coverage:\u003c\/strong\u003e Replaces several OEM and aftermarket part numbers, simplifying parts lookup for older GM sterndrive models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis set is aimed at owners of Mercruiser 120 and 140 GM 2.5L and 3.0L sterndrive engines from the 1980s and early 1990s who want a cost-effective, direct replacement for aging ignition wires. It is useful for boat mechanics performing routine tuneups or anyone restoring a compatible sterndrive where original wiring has become brittle or damaged.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include owners of engines outside the listed GM 153\/181 4-cylinder sterndrive applications or anyone who requires OEM-branded wires with a manufacturer warranty extension; confirm fit before ordering, since the product notes emphasize verifying compatibility first.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDirect compatibility with multiple Mercruiser and equivalent part numbers simplifies replacement.\u003c\/li\u003e\n\u003cli\u003eSilicone outer material gives sensible high-temperature protection in an engine bay environment.\u003c\/li\u003e\n\u003cli\u003eStainless steel conductors provide stable ignition transfer compared with lower-grade cores.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot an OEM branded part, so buyers seeking factory original labeling or extended OEM warranty may prefer alternatives.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHeurofosh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eMercruiser 120, 140 GM 2.5L and 3.0L sterndrive engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire lengths included\u003c\/td\u003e\n\u003ctd\u003e45.5cm (17.9 in), 36cm (14.2 in), 30.7cm (12.1 in) x2, 29.5cm (11.6 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor material\u003c\/td\u003e\n\u003ctd\u003eStainless steel core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation\u003c\/td\u003e\n\u003ctd\u003eSilicone high-temperature sleeve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplaces\u003c\/td\u003e\n\u003ctd\u003eMercruiser 816761A5, 816761Q5, 813720A5, 816761K5; CDI 631-0007; Mallory 9-28020; OMC 503748\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Heurofosh ignition wire set is a practical, value-focused replacement for owners of compatible Mercruiser 120\/140 sterndrive engines who need dependable spark performance and heat protection without paying OEM prices. Confirm fit for your model, but for most qualifying GM 2.5L and 3.0L applications this kit restores proper routing and conductor quality at a sensible cost.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these wires fit my 3.0L Mercruiser?\u003c\/strong\u003e\u003cbr\u003eThey are listed for GM 3.0L 181 I\/L4 sterndrive applications from the late 1980s to early 1990s; verify your engine code before purchasing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat materials are used in the wires?\u003c\/strong\u003e\u003cbr\u003eThe kit uses stainless steel conductors with silicone insulation for improved high-temperature protection and consistent ignition transfer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many wires come in the package?\u003c\/strong\u003e\u003cbr\u003eThe package contains five wires in specified lengths to match factory cylinder positions on 4-cylinder sterndrive engines.\u003c\/p\u003e","brand":"Heurofosh","offers":[{"title":"Default Title","offer_id":48258006122715,"sku":"B0D5GNC7QN","price":49.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61d8ZGxL0uL._SL1500.jpg?v=1778348496","url":"https:\/\/gearmusthave.com\/products\/spark-plug-ignition-coil-wire-set-for-mercruiser-120-140-2-5l-3-0l","provider":"GearMustHave","version":"1.0","type":"link"}