{"product_id":"mercury-seal-884391","title":"Mercury – Cylinder Bore Seal | High-Performance Outboards | Precision Composite | 884391","description":"\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Cylinder Bore Seal | High-Performance Outboards | Precision Composite | 884391\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e There’s a certain comfort that settles in when your engine fires up without a hiccup — that deep, steady confidence only boaters understand. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen you’re pushing a powerful outboard hard, whether you’re chasing early-morning redfish or running upriver with the family, you want every internal seal pulling its weight. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury Marine part number 884391 Cylinder Bore Seal\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e feels like one of those quiet heroes inside the engine, doing its job without ever calling attention to itself. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eYou may not see it, but you’ll notice the difference it makes in how smoothly your motor breathes and how reliably it responds when you lean on the throttle.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHelps maintain a clean, tight seal inside the cylinder bore for consistent engine performance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePrecision-formed composite material built for demanding outboard conditions\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for select Mercury and Mariner 200–300 horsepower FourStroke and two-stroke engines\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eCompatible with DFI, EFI, Sport XS, Pro XS, and select \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e250 horsepower\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e JetDrive SportJet models\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eCrafted for reliable fitment and confident installation with \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecommon\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e tools\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCompatible with Mercury and Mariner 200–300 horsepower outboards\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWorks with FourStroke, two-stroke, DFI, EFI, Sport XS, and Pro XS engines\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits select 250 horsepower JetDrive SportJet applications\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommon on bass boats, offshore center consoles, bay boats, performance skiffs, pontoons, and freshwater fishing rigs\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e When a cylinder bore seal is fresh and properly seated, you can feel it in the engine’s character. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThrottle response \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003estays\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e crisp \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003einstead of\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003elazy\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Idle feels steady instead of wandering. Acceleration has that clean, confident push instead of a hesitant climb. The 884391 seal helps keep combustion pressure exactly where it belongs, supporting smooth performance across the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ewhole powerband\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDurability plays a \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ebig\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e role here \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003etoo\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Engines in the 200–300 horsepower range put real stress on their internal components. Heat builds, pressure changes constantly, and the engine loads can shift with every swell or turn. This Mercury Marine part is designed to stay tight, remain stable under all that stress, and continue sealing cleanly season after season. It’s the kind of part you install once and trust — no second-guessing, no chasing symptoms later. And because the fit is so clean, installation feels straightforward even for boaters who prefer handling some of their own maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e If you’ve ever swapped out a bargain-brand seal only to redo the job a few months later, you know why genuine parts matter.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Mercury builds its components with the same mindset that keeps their engines running strong for decades. Exact tolerances. Matching materials. Engineering \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003emeant\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for real-world use, not just the packaging. When you choose an original Mercury Marine part, you’re \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003echoosing\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e a seal that seats right, stays tight, and protects an engine that probably costs more than your first car.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It’s the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003esmart\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e choice if you care about longevity, reliability, and avoiding avoidable headaches.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does the Cylinder Bore Seal fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt fits select Mercury and Mariner 200–300 horsepower \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eengines\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, including FourStroke, two-stroke, DFI, EFI, Sport XS, Pro XS, and certain 250 horsepower JetDrive SportJets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes this different from aftermarket options?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e The precision. Mercury manufactures it to match exact factory tolerances, which helps it seal better and last longer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know if this is the correct replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Check your engine’s model and serial information. If you fall within the listed horsepower and engine families, this part number is usually the right match.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can it be used in saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes — the materials hold up well in both environments as long as standard maintenance \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis followed\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation straightforward?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e For most boat owners with a bit of mechanical comfort, yes. It installs cleanly with \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecommon\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e shop tools.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935613309219,"sku":"884391","price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/884391_main.jpg?v=1760631274","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-seal-884391","provider":"PartsVu","version":"1.0","type":"link"}