{"product_id":"carburetor-set-3-pack-fits-mercury-mariner-40hp-45hp-55hp-60hp-2-stroke-3-cylinder-replaces-821854t4-821854t5-821854t6","title":"Carburetor Set (3 Pack) – Fits Mercury Mariner 40HP 45HP 55HP 60HP 2-Stroke 3-Cylinder (Replaces 821854T4, 821854T5, 821854T6)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eCarburetor Set (3 Pack)\u003c\/strong\u003e is engineered for Mercury Mariner 40HP, 45HP, 55HP, and 60HP 2-stroke 3-cylinder outboard engines. Designed as a direct-fit replacement, this aftermarket carburetor kit restores fuel delivery and throttle response across all three cylinders.\u003c\/p\u003e\n\u003cp\u003eReplaces OEM part numbers 821854T4, 821854T5, and 821854T6, offering cross-compatibility with original Mercury Mariner components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete 3-carburetor assembly for synchronized fuel distribution\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard marine gasoline and ethanol-blended fuels\u003c\/li\u003e\n  \u003cli\u003ePrecision-calibrated for 2-stroke 3-cylinder Mercury Mariner engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eNotes\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\u003e821854T4\u003c\/td\u003e\n        \u003ctd\u003eOEM Reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e821854T5\u003c\/td\u003e\n        \u003ctd\u003eOEM Reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e821854T6\u003c\/td\u003e\n        \u003ctd\u003eOEM Reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eEngine Configuration\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\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\u003e40HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e821854T4 \/ 821854T5 \/ 821854T6\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e45HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e821854T4 \/ 821854T5 \/ 821854T6\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e55HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e821854T4 \/ 821854T5 \/ 821854T6\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e60HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e821854T4 \/ 821854T5 \/ 821854T6\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eMercury Mariner 2-Stroke 3-Cylinder Outboards\u003c\/dd\u003e\n  \u003cdt\u003eHP Range\u003c\/dt\u003e\n  \u003cdd\u003e40HP \/ 45HP \/ 55HP \/ 60HP\u003c\/dd\u003e\n  \u003cdt\u003eCarburetor Count\u003c\/dt\u003e\n  \u003cdd\u003e3 Units (Complete Set)\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n  \u003cdd\u003eMarine Gasoline (Ethanol-Compatible)\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Type\u003c\/dt\u003e\n  \u003cdd\u003eDirect OEM Replacement\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e3 × Carburetor\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and turn off the fuel supply before beginning work.\u003c\/li\u003e\n  \u003cli\u003eRemove the engine cowling and locate the existing carburetor assembly on the intake manifold.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the fuel lines, throttle linkage, and choke cables from each carburetor.\u003c\/li\u003e\n  \u003cli\u003eRemove the mounting nuts or bolts securing the carburetors to the intake manifold.\u003c\/li\u003e\n  \u003cli\u003eCarefully lift away the old carburetor set, noting the orientation of gaskets and linkages.\u003c\/li\u003e\n  \u003cli\u003eInspect intake manifold surfaces and replace gaskets if worn or damaged.\u003c\/li\u003e\n  \u003cli\u003ePosition the new carburetors onto the manifold, aligning mounting holes and ensuring gaskets sit flush.\u003c\/li\u003e\n  \u003cli\u003eTorque mounting fasteners evenly to manufacturer specifications to prevent air leaks.\u003c\/li\u003e\n  \u003cli\u003eReconnect throttle linkage, choke cables, and fuel lines in the reverse order of removal.\u003c\/li\u003e\n  \u003cli\u003eVerify all connections are secure and fuel lines are properly clamped.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, turn on the fuel supply, and prime the system.\u003c\/li\u003e\n  \u003cli\u003eStart the engine and adjust idle mixture screws as needed for smooth operation across all cylinders.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if my carburetors need replacement?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include rough idling, poor acceleration, difficulty starting, black smoke from the exhaust, or uneven RPM across cylinders. Fuel leaks or visible corrosion around carburetor bodies also indicate replacement is needed.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this set work on 4-stroke Mercury engines?\u003c\/summary\u003e\n  \u003cp\u003eNo, this carburetor set is designed exclusively for 2-stroke 3-cylinder Mercury Mariner engines rated at 40HP, 45HP, 55HP, and 60HP. It is not compatible with 4-stroke or 2-cylinder models.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDo I need to synchronize the carburetors after installation?\u003c\/summary\u003e\n  \u003cp\u003eYes, after installing the carburetor set, you should synchronize throttle response and idle mixture across all three cylinders. Use a tachometer and follow your engine's service manual for proper adjustment procedures.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eAre gaskets and hardware included?\u003c\/summary\u003e\n  \u003cp\u003eThis package includes three carburetors only. Mounting gaskets, bolts, fuel line clamps, and throttle linkage hardware are not included and should be sourced separately or reused if in good condition.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I use this with ethanol-blended fuel?\u003c\/summary\u003e\n  \u003cp\u003eYes, these carburetors are compatible with standard marine gasoline and ethanol-blended fuels (E10). For optimal performance and longevity, use fresh fuel and add a fuel stabilizer if the engine will sit idle for extended periods.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between OEM and aftermarket carburetors?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow fast will my order ship and what does it cost?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat warranty and return options are available?\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should carburetors be replaced or serviced?\u003c\/summary\u003e\n  \u003cp\u003eCarburetors should be inspected annually or after every 100 hours of operation. Replace them if you notice persistent tuning issues, internal corrosion, or damaged internal components that cannot be cleaned or rebuilt.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":51025605558587,"sku":"23CA478","price":275.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/TOP_Center_Bottom_Carburetor_for_Mercury_2-Stroke_40_55_60_HP_821854T4_____821854T5____821854T6_18-7386_-_JLM_MARINE-8285937_4132f6af-e8a0-4ca0-9f1b-8c2dfd6389f2.jpg?v=1772928037","url":"https:\/\/seasierra.com\/products\/carburetor-set-3-pack-fits-mercury-mariner-40hp-45hp-55hp-60hp-2-stroke-3-cylinder-replaces-821854t4-821854t5-821854t6","provider":"SeaSierra","version":"1.0","type":"link"}