{"product_id":"sierra-18-28085-spark-plug-wire-set-4-lead-copper-core-ignition-wires-for-marine-outboards","title":"Sierra Spark Plug Wire Set 18-28085 for Mercury Outboard Engines","description":"\u003cp\u003eThe Sierra 18-28085 Spark Plug Wire Set is a copper-core ignition wire set built for Mercury outboard engines. Each wire carries the ignition spark from the coil or distributor to the spark plug, and consistent, low-resistance delivery is critical for reliable starting, smooth idle, and full power output on the water. Sierra builds this set with a copper core and copper top material, matching the conductive properties expected of marine-grade ignition wiring, and it is designed as a universal fit across the outboard applications it covers rather than a single narrow application.\u003c\/p\u003e\u003cp\u003eThis is a complete set (one unit count) intended as a direct replacement for a worn, cracked, or misfiring wire set, and it carries Sierra's standard limited warranty. Because ignition wires age from heat cycling and vibration, replacing the full set at once rather than one wire at a time helps keep resistance and timing consistent across all cylinders. The 18-28085 is intended for watercraft use and is sold as a universal-fit wire set rather than being restricted to one specific engine block or horsepower rating.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-28085\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Material:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Material Type:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle Service Type:\u003c\/strong\u003e Watercraft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomotive Fit Type:\u003c\/strong\u003e Universal Fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 Count\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Wire Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.68 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282341442\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eMercury outboard engines (universal fit; no specific horsepower, year, or model restriction is specified).\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-28085 spark plug wire set fit?\u003c\/strong\u003e The 18-28085 is a universal-fit wire set intended for Mercury outboard engines; no specific horsepower or model range is specified for it, so it is not limited to one engine block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many wires come in the 18-28085 set?\u003c\/strong\u003e This is sold as one complete set (unit count of 1), covering the full wire set rather than an individual replacement wire.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the conductor made of?\u003c\/strong\u003e Both the core and the top material of the Sierra 18-28085 wire set are copper, which provides low-resistance conduction for reliable spark delivery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-28085 is a Sierra-branded spark plug wire set, manufactured by Sierra International with its own limited warranty coverage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-28085 wire set weigh?\u003c\/strong\u003e The Sierra 18-28085 spark plug wire set weighs 0.68 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy replace the whole wire set instead of a single wire?\u003c\/strong\u003e Replacing all wires together, as with the 18-28085 set, keeps resistance and spark delivery consistent across every cylinder instead of leaving older, higher-resistance wires mixed in with a new one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-28085 set intended for marine or automotive use?\u003c\/strong\u003e It is listed for watercraft use, making it a marine ignition wire set rather than an automotive-specific product.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-28085 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-28085 wire set includes Sierra's standard limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the box with part number 18-28085?\u003c\/strong\u003e The package includes the complete spark plug wire set only, listed under the included components as Wire Set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-28085 fit any outboard, or only certain horsepower ranges?\u003c\/strong\u003e It is designated a universal fit for Mercury outboard engines, with no specific horsepower or year range stated in its specifications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988126839003,"sku":"SIE-18-28085","price":62.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-28085__15400.1722361936.500.750.jpg?v=1785188953","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-28085-spark-plug-wire-set-4-lead-copper-core-ignition-wires-for-marine-outboards","provider":"Good Vibes Marina","version":"1.0","type":"link"}