{"product_id":"west-1799","title":"Sierra MagForce 4-Cylinder MerCruiser 470 Spark Plug Wire Set - 18-8808-2","description":"\u003cp\u003eThe \u003cstrong\u003eSierra 18-8808-2\u003c\/strong\u003e is a MagForce premium marine \u003cstrong\u003e4-cylinder spark plug wire set\u003c\/strong\u003e for select vintage MerCruiser inline-4 sterndrive engines using compatible conventional distributor ignition systems. This 5-lead kit is commonly associated with classic MerCruiser \u003cstrong\u003e3.7L \/ 470-series\u003c\/strong\u003e engines where the ignition layout, distributor style, coil location, and wire lengths match the Sierra application chart.\u003c\/p\u003e\n\u003cp\u003eBuilt for marine engine compartments, this wire set helps deliver consistent ignition output while providing suppression against ignition-related radio frequency interference around onboard electronics.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSierra MagForce premium marine spark plug wire set.\u003c\/li\u003e\n\u003cli\u003eSierra part number: \u003cstrong\u003e18-8808-2\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eDesigned for select \u003cstrong\u003e4-cylinder MerCruiser\u003c\/strong\u003e sterndrive applications.\u003c\/li\u003e\n\u003cli\u003eIncludes \u003cstrong\u003e5 total leads\u003c\/strong\u003e: 4 spark plug wires plus 1 coil wire.\u003c\/li\u003e\n\u003cli\u003e8 mm heavy-duty ignition wire profile.\u003c\/li\u003e\n\u003cli\u003eSpiral-wound stainless-style conductor design for ignition suppression and spark delivery.\u003c\/li\u003e\n\u003cli\u003eSilicone-style jacketing and boots for marine heat and moisture exposure.\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant terminal construction for marine ignition service.\u003c\/li\u003e\n\u003cli\u003eIntended for compatible conventional distributor ignition layouts where specified by application chart.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eKit Contents \u0026amp; Wire Lengths\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis set includes the following wire lengths:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e1 coil wire — 13 in.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 spark plug wire — 23 in.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 spark plug wire — 26 in.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 spark plug wire — 34 in.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 spark plug wire — 39 in.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eConfirm each lead length and terminal end against the original wire set before installation.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCommon application context includes select vintage MerCruiser 4-cylinder sterndrive engines by model, serial range, ignition system, and application chart, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 470\u003c\/strong\u003e applications where specified\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 485\u003c\/strong\u003e applications where specified\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 488\u003c\/strong\u003e applications where specified\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 3.7L\u003c\/strong\u003e applications where specified\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerCruiser 3.7LX\u003c\/strong\u003e applications where specified\u003c\/li\u003e\n\u003cli\u003eSelect \u003cstrong\u003e165 HP to 190 HP 3.7L inline-4\u003c\/strong\u003e MerCruiser platforms where the distributor style and wire routing match this kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUse this wire set only where the Sierra application chart or engine service information confirms \u003cstrong\u003e18-8808-2\u003c\/strong\u003e as the correct replacement.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eConfirm fitment by engine serial number, ignition system, distributor cap style, coil location, plug boot angle, terminal style, and original wire routing before ordering. MerCruiser 3.7L \/ 470-series engines can have different ignition components depending on production range and service history, so engine family alone is not enough to confirm the correct wire set.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace spark plug wires if the engine has hard starting, rough idle, misfire under load, weak acceleration, visible arcing, burned insulation, cracked boots, corroded terminals, loose plug connections, or high resistance in one or more leads. Wires should also be inspected during distributor cap, rotor, spark plug, points, condenser, and seasonal ignition service.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace one wire at a time to preserve the correct firing order. Match each new lead to the closest original length and route it through the factory wire separators or retainers. Keep wires away from exhaust manifolds, belts, pulleys, sharp brackets, and hot engine surfaces. Push each boot fully onto the spark plug, distributor cap, and coil terminal until it seats securely.\u003c\/p\u003e\n\u003cp\u003eFor conventional ignition systems, inspect the distributor cap, rotor, points, condenser, and point gap while replacing the wires. Worn or pitted ignition points can still cause weak spark even with a new wire set installed.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Cross-Reference Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSierra 18-8808-2\u003c\/strong\u003e — MagForce premium marine spark plug wire set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury 84-816761Q6\u003c\/strong\u003e — cross-reference; verify by engine and ignition layout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury 84-813720A6\u003c\/strong\u003e — cross-reference; verify by engine and ignition layout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury 84-43376A6\u003c\/strong\u003e — cross-reference; verify by engine and ignition layout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMallory 9-28014\u003c\/strong\u003e — cross-reference; verify by application\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e18-8808-2\u003c\/strong\u003e is a layout-specific wire set for classic 4-cylinder MerCruiser ignition systems. Before replacing wires, confirm the distributor type and compare the existing lead lengths. On older 470-series engines, ignition complaints often come from a combination of aged wires, worn cap and rotor contacts, incorrect point gap, and heat-damaged routing near the exhaust side of the engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"WEST","offers":[{"title":"Default Title","offer_id":43564266717220,"sku":"SIE-18-8808-2","price":114.93,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/4b8c6f72-200b-41bc-b60d-49ffdcce3eeb.png?v=1781202000","url":"https:\/\/marisolmarine.com\/products\/west-1799","provider":"Marisol Marine Company","version":"1.0","type":"link"}