{"product_id":"sierra-18-28086-spark-plug-wire-set-for-6-cylinder-mercury-outboards-copper-core-boot-connectors","title":"Sierra 18-28086 Spark Plug Wire Set for 6-Cylinder Mercury Outboard Engines","description":"\u003cp\u003eThe Sierra 18-28086 Spark Plug Wire Set is a replacement ignition wire set built for 6-cylinder Mercury outboard engines. Each set is packaged complete and ready to install, restoring reliable spark delivery to engines with worn, cracked, or deteriorated factory wires. The wires use a copper core for consistent electrical conduction along with polyvinyl chloride (PVC) insulation that stands up to engine-bay heat, moisture, and vibration. Boot-style connectors on the wire ends provide a secure, snug fit at the spark plug and coil connection points, helping prevent misfires caused by loose or arcing connections.\u003c\/p\u003e\u003cp\u003eBecause ignition wires degrade over time from heat cycling and exposure to fuel and oil residue, replacing the full set together (rather than one wire at a time) helps ensure even resistance and consistent spark across all cylinders. The 18-28086 set is sized specifically for 6-cylinder applications, matching the cylinder count of the Mercury outboard engines it is designed to service.\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 18-28086\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Cylinders:\u003c\/strong\u003e 6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury outboard engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Copper (core), Polyvinyl Chloride (PVC) (insulation)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Boots\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1 (complete set)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.78125 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282341459\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits 6-cylinder Mercury outboard engines.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the Sierra 18-28086 spark plug wire set designed for?\u003c\/strong\u003e The 18-28086 set is built for 6-cylinder Mercury outboard engines, matching the cylinder count and ignition layout of those engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many cylinders does the 18-28086 wire set cover?\u003c\/strong\u003e Six. The set is sized for 6-cylinder engine applications, providing one wire per cylinder as a complete set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material are the wires made of?\u003c\/strong\u003e The 18-28086 spark plug wires use a copper core for electrical conduction, wrapped in polyvinyl chloride (PVC) insulation for protection against heat and moisture in the engine bay.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of connector do the wires use?\u003c\/strong\u003e Boot-style connectors are used on the Sierra 18-28086 wire set for a secure fit at the spark plug and coil connection points.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a full set or a single wire?\u003c\/strong\u003e The 18-28086 is sold as one complete set covering all 6 cylinders, not as an individual replacement wire.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-28086 set include the spark plugs themselves?\u003c\/strong\u003e No, this is an ignition wire (lead) set only; spark plugs are not included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-28086 wire set weigh?\u003c\/strong\u003e It weighs 0.78125 pounds as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the packaged dimensions of the wire set?\u003c\/strong\u003e The listed item dimensions for the Sierra 18-28086 are 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-28086 a genuine manufacturer part?\u003c\/strong\u003e Yes, it is a genuine Sierra part identified by UPC 808282341459.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy replace all the ignition wires at once instead of just the failed one?\u003c\/strong\u003e Replacing the full 18-28086 set keeps resistance and spark strength consistent across all 6 cylinders, since wires age and degrade at similar rates when exposed to the same heat and vibration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-28086 is the correct wire set for my boat?\u003c\/strong\u003e Confirm your outboard is a 6-cylinder Mercury engine, since the 18-28086 set is matched to that cylinder count.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988126806235,"sku":"SIE-18-28086","price":94.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-28086__36846.1722514505.500.750.jpg?v=1785188268","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-28086-spark-plug-wire-set-for-6-cylinder-mercury-outboards-copper-core-boot-connectors","provider":"Good Vibes Marina","version":"1.0","type":"link"}