{"product_id":"27-804680-gasket-intake-manifold-reed-for-mercury-mariner-6-cyl-3-625-bore-3l-efi-6-cyl-3-6265-bore-3-2l-xs-6-cyl-3-6265-bore-3l-optimax-6-cyl-3-6265-bore-3l-pro-xs-jlm-marine","title":"27-804680 Gasket Intake Manifold Reed for Mercury Mariner 6 Cyl 3.625 Bore 3L EFI 6 Cyl 3.6265 Bore 3.2L XS 6 Cyl 3.6265 Bore 3L Optimax 6 Cyl 3.6265 Bore 3L Pro XS | JLM Marine","description":"\u003ch2\u003eGasket Intake Manifold Reed – Fits Mercury Mariner 200-300 HP EFI\/DFI\/Optimax\/XS Outboards\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003eReed Block Gasket\u003c\/strong\u003e is engineered for Mercury and Mariner 6-cylinder outboard engines ranging from \u003cstrong\u003e200 to 300 HP\u003c\/strong\u003e, including \u003cstrong\u003e3.0L EFI, 3.0L Optimax, 3.2L XS, and Pro XS\u003c\/strong\u003e models. Designed to seal the reed valve assembly to the intake manifold, this gasket ensures optimal air-fuel delivery and prevents vacuum leaks that can compromise performance.\u003c\/p\u003e\n\n\u003cp\u003eThis gasket directly replaces OEM part numbers \u003cstrong\u003e27-804680, 804680, 27-841220, 27-850283, and 850283\u003c\/strong\u003e, providing a precise fit across multiple Mercury and Mariner engine configurations from 2000 to 2018.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eEssential seal for reed valve intake systems on high-performance outboards\u003c\/li\u003e\n\u003cli\u003eCompatible with EFI, DFI (Optimax), and Pro XS engine platforms\u003c\/li\u003e\n\u003cli\u003eDirect-fit replacement for faster, hassle-free installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket sources.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e27-804680\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e804680\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e27-841220\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e27-850283\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e850283\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMariner\u003c\/td\u003e\n\u003ctd\u003eALL\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.625 Bore 3L EFI\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e2002-2008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.625 Bore 3L EFI\u003c\/td\u003e\n\u003ctd\u003e225\u003c\/td\u003e\n\u003ctd\u003e2002-2008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.625 Bore 3L EFI\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e2002-2008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.6265 Bore 3.2L XS\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e2006-2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.6265 Bore 3L Optimax\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e2000-2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.6265 Bore 3L Optimax\u003c\/td\u003e\n\u003ctd\u003e225\u003c\/td\u003e\n\u003ctd\u003e2000-2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.6265 Bore 3L Optimax\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e2008-2014\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.6265 Bore 3L Pro XS\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e2008-2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.6265 Bore 3L Pro XS\u003c\/td\u003e\n\u003ctd\u003e225\u003c\/td\u003e\n\u003ctd\u003e2005-2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6 Cyl 3.6265 Bore 3L Pro XS\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Number\u003c\/td\u003e\n\u003ctd\u003e27-804680\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Type\u003c\/td\u003e\n\u003ctd\u003eGasket Intake Manifold Reed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMercury\/Mariner 6 Cyl 3.0L\/3.2L Outboards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Engine Types\u003c\/td\u003e\n\u003ctd\u003eEFI, DFI (Optimax), XS, Pro XS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis package includes the following components:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 x Gasket Intake Manifold Reed\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan style=\"color:red;\"\u003eThe package contains all the parts shown in the picture.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and relieve any residual fuel pressure in the system. Ensure the engine is cool before beginning work.\u003c\/li\u003e\n\u003cli\u003eRemove the engine cowling and locate the reed valve assembly on the intake manifold. Take note of the orientation of existing gaskets.\u003c\/li\u003e\n\u003cli\u003eUnbolt and carefully remove the reed valve housing from the intake manifold. Set aside all fasteners in a safe place.\u003c\/li\u003e\n\u003cli\u003ePeel off the old gasket material from both the reed block and intake manifold surfaces. Use a gasket scraper or plastic blade to avoid scratching machined surfaces.\u003c\/li\u003e\n\u003cli\u003eClean both mating surfaces thoroughly with a degreaser or carburetor cleaner. Allow all surfaces to dry completely before proceeding.\u003c\/li\u003e\n\u003cli\u003ePosition the new gasket over the intake manifold studs or alignment pins, ensuring it sits flat without wrinkles or tears.\u003c\/li\u003e\n\u003cli\u003eCarefully align the reed valve housing onto the gasket and hand-thread all mounting bolts. Double-check alignment before tightening.\u003c\/li\u003e\n\u003cli\u003eTorque the mounting bolts to the manufacturer's specification in a cross-pattern sequence to ensure even gasket compression.\u003c\/li\u003e\n\u003cli\u003eReconnect any fuel lines, vacuum hoses, or electrical connectors that were removed during disassembly.\u003c\/li\u003e\n\u003cli\u003eReinstall the engine cowling and reconnect the battery. Start the engine and check for vacuum leaks or unusual sounds.\u003c\/li\u003e\n\u003cli\u003eRun the engine at idle for several minutes and inspect the gasket area for any fuel or air leaks.\u003c\/li\u003e\n\u003cli\u003ePerform a brief test run under normal operating conditions to confirm proper performance and seal integrity.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this gasket fits my specific Mercury or Mariner engine?\u003c\/strong\u003e\u003cbr\u003e\nCross-reference your engine's model, horsepower, and year range with the compatibility table above. You can also verify your original part number matches one of the OEM numbers listed (27-804680, 804680, 27-841220, 27-850283, or 850283).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow often should I replace the reed block gasket?\u003c\/strong\u003e\u003cbr\u003e\nReplace the gasket whenever you service or remove the reed valve assembly, or if you notice performance issues such as rough idling, poor acceleration, or visible fuel\/air leaks around the intake manifold.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat are the signs that this gasket has failed?\u003c\/strong\u003e\u003cbr\u003e\nCommon symptoms include loss of power, erratic idle, fuel smell near the engine, or hissing sounds from the intake area. Vacuum leaks caused by a deteriorated gasket will disrupt the air-fuel mixture and reduce engine efficiency.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I reuse the old gasket if it looks intact?\u003c\/strong\u003e\u003cbr\u003e\nNo. Gaskets are designed for one-time use and compress to form a seal. Reusing an old gasket can result in improper sealing, vacuum leaks, and potential engine damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this gasket compatible with both EFI and Optimax (DFI) engines?\u003c\/strong\u003e\u003cbr\u003e\nYes. This gasket is designed to fit Mercury 3.0L and 3.2L 6-cylinder engines across EFI, DFI (Optimax), XS, and Pro XS platforms from 2000 to 2018.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOEM vs. Aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nThis listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nWe offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nThis product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51983453520185,"sku":"3460","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_68ded1cc-ada0-48eb-be21-3a84309be525.jpg?v=1772505289","url":"https:\/\/jlmmarine.com\/es\/products\/27-804680-gasket-intake-manifold-reed-for-mercury-mariner-6-cyl-3-625-bore-3l-efi-6-cyl-3-6265-bore-3-2l-xs-6-cyl-3-6265-bore-3l-optimax-6-cyl-3-6265-bore-3l-pro-xs-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}