{"product_id":"mercury-ngk-bu8h-10-13686q","title":"Mercury – Quicksilver Spark Plug | Ignition System Component | NGK BU8H Semi-Surface Gap | 13686Q","description":"\u003cp data-start=\"0\" data-end=\"103\"\u003e\u003cstrong data-start=\"0\" data-end=\"101\"\u003eMercury – Quicksilver Spark Plug | Ignition System Component | NGK BU8H Semi-Surface Gap | 13686Q\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"105\" data-end=\"108\"\u003e\n\u003ch3 data-start=\"110\" data-end=\"128\"\u003e\u003cstrong data-start=\"114\" data-end=\"126\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"129\" data-end=\"688\"\u003eA smooth, clean spark is the heartbeat of your engine, and the \u003cstrong data-start=\"192\" data-end=\"251\"\u003eMercury Marine 13686Q Quicksilver Spark Plug (NGK BU8H)\u003c\/strong\u003e keeps that heartbeat steady. Built with a \u003cstrong data-start=\"294\" data-end=\"327\"\u003esemi-surface discharge design\u003c\/strong\u003e, it delivers efficient ignition and helps burn away carbon buildup before it can foul your plugs. Whether you’re easing out of the marina or opening up on the bay, this plug keeps your outboard firing crisp and clean. It’s dependable, tough, and designed specifically for marine use — the kind of plug you install and then forget about because it just works.\u003c\/p\u003e\n\u003chr data-start=\"690\" data-end=\"693\"\u003e\n\u003ch3 data-start=\"695\" data-end=\"717\"\u003e\u003cstrong data-start=\"699\" data-end=\"715\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"720\" data-end=\"815\"\u003e\n\u003cstrong data-start=\"720\" data-end=\"732\"\u003ePurpose:\u003c\/strong\u003e Provides consistent, clean ignition and prevents fouling for smooth performance.\u003c\/li\u003e\n\u003cli data-start=\"818\" data-end=\"934\"\u003e\n\u003cstrong data-start=\"818\" data-end=\"829\"\u003eDesign:\u003c\/strong\u003e Features \u003cstrong data-start=\"839\" data-end=\"877\"\u003eNGK’s semi-surface discharge style\u003c\/strong\u003e with small side electrodes — no gap adjustment needed.\u003c\/li\u003e\n\u003cli data-start=\"937\" data-end=\"1060\"\u003e\n\u003cstrong data-start=\"937\" data-end=\"950\"\u003eMaterial:\u003c\/strong\u003e Built with a \u003cstrong data-start=\"964\" data-end=\"1007\"\u003epure alumina silicate ceramic insulator\u003c\/strong\u003e for strength, heat transfer, and break resistance.\u003c\/li\u003e\n\u003cli data-start=\"1063\" data-end=\"1169\"\u003e\n\u003cstrong data-start=\"1063\" data-end=\"1072\"\u003eCore:\u003c\/strong\u003e \u003cstrong data-start=\"1073\" data-end=\"1100\"\u003eCopper center electrode\u003c\/strong\u003e draws away heat for efficient combustion and reduced pre-ignition.\u003c\/li\u003e\n\u003cli data-start=\"1172\" data-end=\"1267\"\u003e\n\u003cstrong data-start=\"1172\" data-end=\"1187\"\u003eProtection:\u003c\/strong\u003e \u003cstrong data-start=\"1188\" data-end=\"1215\"\u003eTrivalent metal plating\u003c\/strong\u003e prevents corrosion and makes plug removal easier.\u003c\/li\u003e\n\u003cli data-start=\"1270\" data-end=\"1385\"\u003e\n\u003cstrong data-start=\"1270\" data-end=\"1286\"\u003ePerformance:\u003c\/strong\u003e Ribbed suppressor seal prevents “flash over” and misfire; triple seal design eliminates leakage.\u003c\/li\u003e\n\u003cli data-start=\"1388\" data-end=\"1474\"\u003e\n\u003cstrong data-start=\"1388\" data-end=\"1404\"\u003eEase of Use:\u003c\/strong\u003e Pre-gapped and ready to install using a standard spark plug socket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1476\" data-end=\"1479\"\u003e\n\u003ch3 data-start=\"1481\" data-end=\"1518\"\u003e\u003cstrong data-start=\"1485\" data-end=\"1516\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1521\" data-end=\"1637\"\u003eDesigned for \u003cstrong data-start=\"1534\" data-end=\"1584\"\u003eselect Mercury and Mariner TwoStroke outboards\u003c\/strong\u003e that specify NGK BU8H plugs in the owner’s manual.\u003c\/li\u003e\n\u003cli data-start=\"1640\" data-end=\"1711\"\u003eCommonly used in \u003cstrong data-start=\"1657\" data-end=\"1679\"\u003emidrange outboards\u003c\/strong\u003e between 30 and 90 horsepower.\u003c\/li\u003e\n\u003cli data-start=\"1714\" data-end=\"1834\"\u003eIdeal for \u003cstrong data-start=\"1724\" data-end=\"1783\"\u003efishing boats, pontoons, inflatables, and utility craft\u003c\/strong\u003e powered by dependable Mercury TwoStroke engines.\u003c\/li\u003e\n\u003cli data-start=\"1837\" data-end=\"1941\"\u003eAlways check your \u003cstrong data-start=\"1855\" data-end=\"1893\"\u003eengine’s owner’s or service manual\u003c\/strong\u003e to confirm compatibility before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1943\" data-end=\"1946\"\u003e\n\u003ch3 data-start=\"1948\" data-end=\"1990\"\u003e\u003cstrong data-start=\"1952\" data-end=\"1988\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1991\" data-end=\"2337\"\u003eThe \u003cstrong data-start=\"1995\" data-end=\"2016\"\u003e13686Q spark plug\u003c\/strong\u003e is made for real-world boating. Its semi-surface design improves ignition even when carbon starts to build up — keeping your engine firing when cheaper plugs would foul. The copper core dissipates heat fast, preventing pre-ignition or knocking, while the ceramic insulator keeps the plug stable under high compression.\u003c\/p\u003e\n\u003cp data-start=\"2339\" data-end=\"2672\"\u003eYou’ll notice quicker starts, smoother idle, and more consistent throttle response across all RPMs. It also resists seizing in the cylinder head, so when it’s time to replace them, they back out easily without a fight. It’s a small piece of equipment that plays a big role in your engine’s reliability, efficiency, and performance.\u003c\/p\u003e\n\u003chr data-start=\"2674\" data-end=\"2677\"\u003e\n\u003ch3 data-start=\"2679\" data-end=\"2700\"\u003e\u003cstrong data-start=\"2683\" data-end=\"2698\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2701\" data-end=\"2992\"\u003eNot every spark plug is up to the job of marine duty. Automotive plugs can corrode, stick, or overheat when exposed to salt and moisture. The \u003cstrong data-start=\"2843\" data-end=\"2865\"\u003eQuicksilver 13686Q\u003c\/strong\u003e — paired with \u003cstrong data-start=\"2880\" data-end=\"2901\"\u003eNGK’s BU8H design\u003c\/strong\u003e — is tested and approved by Mercury Marine for the exact conditions your outboard faces.\u003c\/p\u003e\n\u003cp data-start=\"2994\" data-end=\"3293\"\u003eIt’s engineered to last longer, resist corrosion, and deliver steady spark energy in wet, hot, and high-vibration environments. With OEM-grade quality, you’re not just getting a plug — you’re getting a proven ignition component that keeps your Mercury engine performing the way it was designed to.\u003c\/p\u003e\n\u003chr data-start=\"3295\" data-end=\"3298\"\u003e\n\u003ch3 data-start=\"3300\" data-end=\"3313\"\u003e\u003cstrong data-start=\"3304\" data-end=\"3311\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"3315\" data-end=\"3494\"\u003e\u003cstrong data-start=\"3315\" data-end=\"3363\"\u003eQ1: Which engines use the 13686Q spark plug?\u003c\/strong\u003e\u003cbr data-start=\"3363\" data-end=\"3366\"\u003eIt fits \u003cstrong data-start=\"3374\" data-end=\"3424\"\u003eselect Mercury and Mariner TwoStroke outboards\u003c\/strong\u003e that specify NGK BU8H plugs — check your owner’s manual to confirm.\u003c\/p\u003e\n\u003cp data-start=\"3496\" data-end=\"3696\"\u003e\u003cstrong data-start=\"3496\" data-end=\"3566\"\u003eQ2: What makes this plug different from standard automotive plugs?\u003c\/strong\u003e\u003cbr data-start=\"3566\" data-end=\"3569\"\u003eIt’s built for marine use — corrosion resistant, self-cleaning, and designed to perform under heavy load and long idle times.\u003c\/p\u003e\n\u003cp data-start=\"3698\" data-end=\"3831\"\u003e\u003cstrong data-start=\"3698\" data-end=\"3750\"\u003eQ3: Does it require gapping before installation?\u003c\/strong\u003e\u003cbr data-start=\"3750\" data-end=\"3753\"\u003eNo. The \u003cstrong data-start=\"3761\" data-end=\"3794\"\u003esemi-surface discharge design\u003c\/strong\u003e comes pre-gapped to factory specs.\u003c\/p\u003e\n\u003cp data-start=\"3833\" data-end=\"3991\"\u003e\u003cstrong data-start=\"3833\" data-end=\"3882\"\u003eQ4: How often should spark plugs be replaced?\u003c\/strong\u003e\u003cbr data-start=\"3882\" data-end=\"3885\"\u003eIt depends on your usage, but most boaters replace them once per season or after 100 hours of operation.\u003c\/p\u003e\n\u003cp data-start=\"3993\" data-end=\"4124\"\u003e\u003cstrong data-start=\"3993\" data-end=\"4064\"\u003eQ5: Can this be used in both saltwater and freshwater environments?\u003c\/strong\u003e\u003cbr data-start=\"4064\" data-end=\"4067\"\u003eYes — its corrosion-resistant plating is made for both.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46932966277411,"sku":"PV684700","price":6.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/IMG_7741.jpg?v=1747169058","url":"https:\/\/partsvu.com\/fr\/products\/mercury-ngk-bu8h-10-13686q","provider":"PartsVu","version":"1.0","type":"link"}