{"product_id":"carburetor-set-fits-mercury-2-stroke-40-60-hp-replaces-821854t4-821854t5-821854t6","title":"Carburetor Set – Fits Mercury 2-Stroke 40-60 HP (Replaces 821854T4, 821854T5, 821854T6)","description":"\u003cstyle\u003e\n\/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n.ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n\/* Base table styles *\/\ntable.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\ntable.ss-table th, table.ss-table td {\n  padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n}\n\n\/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\ntable.ss-table th {\n  white-space:nowrap;       \/* Do not wrap *\/\n  word-break:normal;        \/* Don’t break words *\/\n  letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n  font-weight:600;\n  background:#f8fafc;\n}\n\n\/* Small screen optimization *\/\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\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis complete \u003cstrong\u003eTOP Center Bottom Carburetor Set\u003c\/strong\u003e is a direct-fit replacement assembly for 3-cylinder Mercury Marine 2-Stroke outboard engines from 40 HP to 60 HP, manufactured between 1999–2006.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct interchange for Mercury part numbers 821854T4, 821854T5, 821854T6 and their alternate versions, as well as complete Sierra aftermarket set 18-7386.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for direct, hassle-free installation using factory hardware.\u003c\/li\u003e\n\u003cli\u003eCompatible with all original factory fuel lines and throttle\/choke linkages.\u003c\/li\u003e\n\u003cli\u003eIncludes all three required carburetors: Top, Center, and Bottom.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket suppliers.\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\u003c\/td\u003e\n        \u003ctd\u003e821854T4 \/ 821854A4 \/ 821854T19\u003c\/td\u003e\n        \u003ctd\u003eTop Carburetor\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e821854T5 \/ 821854A5 \/ 821854T20\u003c\/td\u003e\n        \u003ctd\u003eCenter Carburetor\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e821854T6 \/ 821854A6 \/ 821854T21\u003c\/td\u003e\n        \u003ctd\u003eBottom Carburetor\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-7386\u003c\/td\u003e\n        \u003ctd\u003eComplete Set (Top, Center \u0026amp; Bottom)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model and year range in the table below to ensure accurate fitment.\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\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\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\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e40\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1999–2006\u003c\/td\u003e\n        \u003ctd\u003e821854T4 (Top), 821854T5 (Center), 821854T6 (Bottom)\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e45\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1999–2006\u003c\/td\u003e\n        \u003ctd\u003e821854T4 (Top), 821854T5 (Center), 821854T6 (Bottom)\u003c\/td\u003e\n        \u003ctd\u003eIncludes JET models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e50\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1999–2006\u003c\/td\u003e\n        \u003ctd\u003e821854T4 (Top), 821854T5 (Center), 821854T6 (Bottom)\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e55\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1999–2006\u003c\/td\u003e\n        \u003ctd\u003e821854T4 (Top), 821854T5 (Center), 821854T6 (Bottom)\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e3-Cylinder\u003c\/td\u003e\n        \u003ctd\u003e60\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1999–2006\u003c\/td\u003e\n        \u003ctd\u003e821854T4 (Top), 821854T5 (Center), 821854T6 (Bottom)\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\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eComplete Carburetor Set (3 carburetors)\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eOEM Factory Linkage Compatible\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eZinc Alloy\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\/Metallic\u003c\/dd\u003e\n  \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eFactory Standard\u003c\/dd\u003e\n  \u003cdt\u003eThread Size\u003c\/dt\u003e\n\u003cdd\u003eFactory Standard\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 Year (Manufacturer's Defects)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eManufactured to OEM specifications, ISO9002 certified production\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e3 x Carburetor Assembly\u003c\/span\u003e (Replaces Top, Center, and Bottom positions)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and secure any loose wires before starting.\u003c\/li\u003e\n  \u003cli\u003eTurn off the fuel supply valve and safely disconnect the fuel line from the carburetors.\u003c\/li\u003e\n  \u003cli\u003eCarefully label and disconnect all throttle linkages, choke linkages, and any vacuum or breather hoses.\u003c\/li\u003e\n  \u003cli\u003eRemove the nuts or bolts securing the carburetor assembly to the intake manifold and remove the old set.\u003c\/li\u003e\n  \u003cli\u003eClean the manifold mounting surface and install the new carburetors with fresh gaskets.\u003c\/li\u003e\n  \u003cli\u003eReconnect all linkages and hoses to their correct positions, ensuring free movement.\u003c\/li\u003e\n  \u003cli\u003eReconnect the fuel line and turn on the fuel supply, checking thoroughly for any leaks.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery.\u003c\/li\u003e\n  \u003cli\u003eStart the engine in a well-ventilated area. It may require fine-tuning of the idle mixture or speed screws for optimal performance.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this set fit my specific Mercury motor?\u003c\/summary\u003e\n  \u003cp\u003eThis set is designed for the Mercury 3-cylinder 40-60 HP 2-stroke models listed in the Engine \u0026amp; Model Compatibility table. Please verify your model and year range before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eAre these carburetors pre-adjusted?\u003c\/summary\u003e\n  \u003cp\u003eThese carburetors are preset at the factory to baseline specifications that work for most engines. However, due to variations in engine wear and atmospheric conditions, minor adjustments to the idle speed or air\/fuel mixture screws may be necessary for optimal performance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs my old carburetors need replacing?\u003c\/summary\u003e\n  \u003cp\u003eCommon symptoms of failing carburetors include difficulty starting, rough or erratic idling, engine stalling at low speeds, hesitation upon acceleration, black smoke from the exhaust, and visible fuel leaks from the carburetor body.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I distinguish the Top, Center, and Bottom carburetors?\u003c\/summary\u003e\n  \u003cp\u003eThe carburetors are often marked (e.g., with \"TOP\" or position numbers) on their housing. If not marked, compare them closely to your old units before removal; there are typically subtle differences in linkage arms or jetting. It is critical to install each carburetor in its correct position.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\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\u003eShipping speed \u0026amp; 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\u003eWarranty \u0026amp; returns\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\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs 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\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723972284731,"sku":"UP-3GS1-KJES","price":275.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/UP-3GS1-KJES.png?v=1763038845","url":"https:\/\/seasierra.com\/products\/carburetor-set-fits-mercury-2-stroke-40-60-hp-replaces-821854t4-821854t5-821854t6","provider":"SeaSierra","version":"1.0","type":"link"}