{"title":"Tohatsu 4-Stroke 2.5HP Outboard Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eThis page is for Tohatsu 4-Stroke 2.5HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Tohatsu collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter \u0026amp; Sort controls to narrow by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\" style=\"display:inline-block;padding:10px 14px;background:#004a7c;color:#fff;text-decoration:none;border-radius:4px;\"\u003eBrowse All Tohatsu Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 2.5HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eSerial\/ID plate location: Look on the transom clamp bracket or lower cowl near the mounting screws for the model code and serial number.\u003c\/li\u003e\n    \u003cli\u003eReading the code: 4‑stroke portable models are commonly labeled like MFS2.5B, with a suffix for shaft length (S = short 15 in, L = long 20 in). Regional year codes may be appended; use the serial to confirm parts.\u003c\/li\u003e\n    \u003cli\u003e4‑Stroke cues: An engine oil filler cap and dipstick are present on the powerhead. The typical spark plug for this platform is NGK DCPR6E.\u003c\/li\u003e\n    \u003cli\u003ePlatform note: Many wear items are shared with the 3.5HP sibling (MFS3.5B), but propeller pitch and certain carburetor parts differ. Verify your exact model, shaft length, and serial before ordering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n  \u003ch3\u003eTohatsu 2.5HP 4‑Stroke Portable Platform\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSingle‑cylinder, carbureted 4‑stroke, water‑cooled with above‑prop exhaust; manual start; dog clutch F‑N; gear ratio about 2.15:1.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eMFS2.5B (S\/L). Many service parts overlap with MFS3.5B; confirm by serial.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLightweight and portable, simple maintenance, low fuel use, reliable starting, and integral fuel tank (~1.0 L) for easy transport.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eUse NMMA FC‑W 10W‑30 engine oil (approx. 300 mL). Gear oil GL‑5 SAE 80–90 (approx. 180 mL). Typical WOT range ~4500–5500 rpm. Confirm shaft length (S\/L) and serial for water pump and gearcase parts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for small 4‑stroke portables. Always follow the official service manual for your exact model and operating conditions.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEngine oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eFirst 20 hrs; then every 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e10W‑30 NMMA FC‑W\/API SF‑SM; approx. 300 mL. No external oil filter on this platform.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\"\u003eTohatsu Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEvery 100 hrs or 6 months\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eGL‑5 SAE 80–90; approx. 180 mL. Replace plug gaskets; check for milky oil (water ingress).\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-lower-unit-seal-kits\"\u003eTohatsu Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSpark plug\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect every 100 hrs; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eNGK DCPR6E; gap 0.8–0.9 mm. Replace if fouled, worn, or damaged.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eFuel filter \/ strainer\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect 50–100 hrs; replace if contaminated\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck inline filter and carburetor screen for debris or varnish.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect annually; replace impeller every 12 months\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEssential for cooling flow; replace sooner if weak telltale or sandy use.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-water-pump-repair-kits\"\u003eTohatsu Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAnodes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect often; replace at ~50% loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eProtects against galvanic corrosion in salt\/brackish water.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePropeller \u0026amp; shear pin\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect regularly\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck for bent\/damaged blades; keep spare shear and split pins; select pitch to meet WOT rpm.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003cp style=\"font-size:12px;color:#555;\"\u003e*Intervals assume typical recreational use; shorten for heavy duty, sandy\/silty water, or commercial operation.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service — \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System — \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-water-pump-repair-kits\"\u003eTohatsu Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase Seals — \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-lower-unit-seal-kits\"\u003eTohatsu Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System — \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical — \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion — \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eAccessories — \u003ca href=\"https:\/\/seasierra.com\/collections\/boat-accessories\"\u003eBoat Accessories\u003c\/a\u003e, \u003ca href=\"https:\/\/seasierra.com\/collections\/propeller-guards\"\u003ePropeller Guards\u003c\/a\u003e, \u003ca href=\"https:\/\/seasierra.com\/collections\/outboard-hydrofoil-stabilizers\"\u003eOutboard Hydrofoil Stabilizers\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWeak telltale or overheat\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect water inlet screen for blockage; verify impeller condition; confirm thermostat operation; ensure motor is fully down in water.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWater pump kit\/impeller, pump gaskets, intake screen, thermostat\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck for damaged prop or sheared pin; confirm fresh fuel; inspect fuel filter and carburetor for debris; check spark plug condition.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePropeller, shear pin\/split pin, fuel filter, spark plug\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eVerify choke\/enrichment works; replace stale fuel; check plug gap; inspect for air leaks at fuel lines; warm up adequately.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSpark plug, fuel filter, carburetor service parts\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eGearcase noise or milky gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eDrain and inspect gear oil; look for water intrusion; replace plug gaskets; pressure test if needed.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLower unit seal kit, gear oil plug gaskets, bearings (as needed)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eExcessive smoke\/oil discharge (4‑stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck for overfilled engine oil; verify engine is stored and operated upright; inspect breather lines.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEngine oil and seals, breather components\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between the 2.5HP and 3.5HP platforms?\u003c\/summary\u003e\n    \u003cp\u003eMany wear items (water pump components, gearcase seals, anodes, some hardware) are shared, but propeller pitch, some carburetor parts, and model‑specific items can differ. Always verify by model code, shaft length, and serial.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eInspect annually and replace the impeller about every 12 months, or sooner if you see a weak telltale, overheating, or frequent sandy\/silty operation.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change lower unit gear oil?\u003c\/summary\u003e\n    \u003cp\u003eAbout every 100 hours or at least once per season. Change immediately if the oil turns milky, which indicates water intrusion.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003ePlease provide the full model code (e.g., MFS2.5B), serial number, shaft length (S or L), and the country\/region of sale. Photos of the nameplate and the old part also help confirm a match.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eReady to find parts for your Tohatsu 2.5HP? Browse the main Tohatsu collection and use the filters to narrow by horsepower, year, and model.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\" style=\"display:inline-block;padding:10px 14px;background:#004a7c;color:#fff;text-decoration:none;border-radius:4px;\"\u003eShop Tohatsu Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#555;font-size:12px;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"thermostat-kit-122-f-50-c-fits-tohatsu-nissan-2-50-hp-replaces-345-01030-0-346-01030-0","title":"Thermostat Kit, 122°F (50°C) – Fits Selected Tohatsu and Nissan 2–50 HP Outboards","description":"\u003csection\u003e\n\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 { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003ethermostat kit\u003c\/strong\u003e is designed for selected Tohatsu and Nissan outboard engines using a 122°F (50°C) thermostat. The listed applications cover selected 2–50 HP models, including M, MD, MF, MFS, NS, and NSD series engines. Because application can vary by model, year, serial range, and cooling-system configuration, confirm the engine model and the original thermostat part number before ordering.\u003c\/p\u003e\n\u003cp\u003eThe kit is listed as a replacement for Tohatsu references \u003cstrong\u003e345-01030-0\u003c\/strong\u003e, \u003cstrong\u003e345010300M\u003c\/strong\u003e, \u003cstrong\u003e345010301M\u003c\/strong\u003e, \u003cstrong\u003e346-01030-0\u003c\/strong\u003e, \u003cstrong\u003e346-01030-1\u003c\/strong\u003e, \u003cstrong\u003e350-01030-1\u003c\/strong\u003e, and \u003cstrong\u003e3H6-01030-0\u003c\/strong\u003e. These numbers are manufacturer or interchange references, not the seller's internal product identifier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReplacement thermostat service kit for selected Tohatsu and Nissan outboards.\u003c\/li\u003e\n\u003cli\u003e122°F (50°C) thermostat opening-temperature rating.\u003c\/li\u003e\n\u003cli\u003eIncludes the thermostat, housing gasket, and two thermostat seals as listed.\u003c\/li\u003e\n\u003cli\u003eVerify the original part number and complete engine identification before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the following references to compare the thermostat with the part removed from your engine.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e345010300M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e345010301M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e346-01030-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e346-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e350-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3H6-01030-0\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\u003eThe applications below are the listed model references for this thermostat kit. Model names alone may not identify every production variant; check the model code, year or serial range where applicable, stroke type, and OEM part number together.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke \/ Configuration\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\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS2\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS2.5\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS3.5C\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS5\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMF6\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2006\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eYear-specific application as listed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM8B\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM9.8B\u003c\/td\u003e\n\u003ctd\u003e9.8\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM9.9D2\u003c\/td\u003e\n\u003ctd\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM15D2\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM18E2\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM25C3\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eYear-specific application as listed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM30A4\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eYear-specific application as listed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM40C\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eYear-specific application as listed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMD40A, MD40B, MD40B2\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003eTLDI direct-injection 2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010–2014\u003c\/td\u003e\n\u003ctd\u003e345010300M\u003c\/td\u003e\n\u003ctd\u003eVerify model and serial range.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMD50A, MD50B, MD50B2\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003eTLDI direct-injection 2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010–2014\u003c\/td\u003e\n\u003ctd\u003e345010300M\u003c\/td\u003e\n\u003ctd\u003eVerify model and serial range.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNS25C3\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eYear-specific application as listed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNS30A4\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2003\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eYear-specific application as listed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNS40C\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003ctd\u003eYear-specific application as listed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNSD40B, NSD40B2\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003eTLDI direct-injection 2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010–2014\u003c\/td\u003e\n\u003ctd\u003e345010300M\u003c\/td\u003e\n\u003ctd\u003eVerify model and serial range.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNSD50B, NSD50B2\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003eTLDI direct-injection 2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010–2014\u003c\/td\u003e\n\u003ctd\u003e345010300M\u003c\/td\u003e\n\u003ctd\u003eVerify model and serial range.\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\u003cdl\u003e\n\u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat kit with housing gasket and seals\u003c\/dd\u003e\n\u003cdt\u003eTemperature Rating\u003c\/dt\u003e\n\u003cdd\u003e122°F (50°C) opening temperature\u003c\/dd\u003e\n\u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eReplacement installation in the existing thermostat housing\u003c\/dd\u003e\n\u003cdt\u003eHousing Finish\u003c\/dt\u003e\n\u003cdd\u003eSilver\/metallic as listed\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Thermostat\u003c\/li\u003e\n\u003cli\u003e1 × Thermostat housing gasket\u003c\/li\u003e\n\u003cli\u003e2 × Thermostat seals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eAllow the engine to cool completely and follow the service manual's safety procedures.\u003c\/li\u003e\n\u003cli\u003eDisconnect the battery if required by the engine manufacturer's service procedure.\u003c\/li\u003e\n\u003cli\u003eLocate the thermostat housing and remove the cover fasteners.\u003c\/li\u003e\n\u003cli\u003eRemove the old thermostat, gasket, and seals, noting their orientation.\u003c\/li\u003e\n\u003cli\u003eClean the mating surfaces carefully without damaging the housing or cover.\u003c\/li\u003e\n\u003cli\u003eInstall the replacement thermostat, seals, and gasket in the correct orientation.\u003c\/li\u003e\n\u003cli\u003eReinstall the housing cover and tighten the fasteners to the manufacturer's specified torque.\u003c\/li\u003e\n\u003cli\u003eRestore the cooling system as required for the engine, start it, and check for leaks and proper temperature control.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if my thermostat is failing?\u003c\/summary\u003e\u003cp\u003ePossible symptoms include overheating, running below the expected operating temperature, inconsistent temperature behavior, or restricted cooling-system flow. Diagnose the cause before replacing the thermostat.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat does the 122°F (50°C) rating mean?\u003c\/summary\u003e\u003cp\u003eIt identifies the thermostat's listed opening temperature. The thermostat begins opening near this temperature to regulate cooling-water flow through the engine according to the engine's design.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this a complete kit?\u003c\/summary\u003e\u003cp\u003eThe listed package contains one thermostat, one thermostat housing gasket, and two thermostat seals. Confirm that these components match the arrangement on your engine before installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill this fit a model year not shown?\u003c\/summary\u003e\u003cp\u003eDo not rely on horsepower alone. Compare the exact model, year or serial range, stroke\/configuration, and original OEM part number with the information above and the engine service documentation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhen should a thermostat be replaced?\u003c\/summary\u003e\u003cp\u003eReplace it when testing identifies a fault, when it is damaged or contaminated, or during cooling-system service if the manufacturer's maintenance procedure calls for replacement. Follow the engine service manual for testing and maintenance intervals.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\u003cp\u003eNo. This listing is for an aftermarket replacement kit. The OEM numbers shown are reference numbers used for application comparison.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the shipping speed and cost?\u003c\/summary\u003e\u003cp\u003eAvailable shipping methods, delivery estimates, and shipping charges are shown at checkout and vary by destination and service level.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\u003cp\u003eWarranty and return terms are governed by the seller's current policies. Review the applicable policy before purchase and contact support if the delivered item does not match the listing or arrives damaged.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify the complete engine model, year or serial range, stroke\/configuration, and original part number before ordering.\u003c\/li\u003e\n\u003cli\u003eCompare the supplied parts with the removed components before installation.\u003c\/li\u003e\n\u003cli\u003eUse the manufacturer's service manual for torque values, cooling-system procedures, testing, and safety requirements.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended when the correct procedure or engine application is uncertain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — Marine replacement parts selected for fit, function, and service use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Fulfillment\u003c\/strong\u003e — Shipping options and delivery estimates are provided at checkout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Competitive replacement-part pricing with application information to support part selection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718270488891,"sku":"GH-TH23616-T","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/GH-TH23616-T.png?v=1762958706"},{"product_id":"thermostat-kit-fits-tohatsu-nissan-2-50-hp-outboards-replaces-346-01030-345-01030","title":"Thermostat Kit, 50°C (122°F) – Fits Tohatsu\/Nissan 2–50 HP Outboards","description":"\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\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\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e50°C (122°F) thermostat kit\u003c\/strong\u003e is an aftermarket replacement for selected Tohatsu and Nissan outboard motors. It is intended to help the cooling system maintain the engine's specified operating temperature and includes the service components needed for a thermostat replacement.\u003c\/p\u003e\n\u003cp\u003eThe kit is associated with Tohatsu\/Nissan thermostat references including \u003cstrong\u003e345-01030-0\u003c\/strong\u003e, \u003cstrong\u003e345-01030-1\u003c\/strong\u003e, \u003cstrong\u003e346-01030-0\u003c\/strong\u003e, \u003cstrong\u003e346-01030-1\u003c\/strong\u003e, \u003cstrong\u003e350-01030-1\u003c\/strong\u003e, and \u003cstrong\u003e3H6-01030-0\u003c\/strong\u003e. Reference numbers are provided for identification; always confirm the exact model, year, stroke, and serial-number range before ordering.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e50°C (122°F) thermostat rating.\u003c\/li\u003e\n\u003cli\u003eKit format for thermostat service.\u003c\/li\u003e\n\u003cli\u003eIncludes a thermostat, housing gasket, and thermostat seals.\u003c\/li\u003e\n\u003cli\u003eFor selected Tohatsu and Nissan 2-stroke and 4-stroke outboards.\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 the following manufacturer reference numbers when comparing your original part and engine parts diagram.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eManufacturer Reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e345-01030-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e345-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e346-01030-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e346-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e350-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e3H6-01030-0\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\u003eVerified Engine Compatibility Examples\u003c\/h2\u003e\n\u003cp\u003eThe catalog relationships below keep the model, horsepower, stroke, and year conditions together. They are examples of documented applications, not a substitute for checking the complete engine identification and serial-number information.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Verified Engine Compatibility Examples\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel or Model Group\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYear Evidence\u003c\/th\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM6 \/ M8 \/ M9.8B\u003c\/td\u003e\n\u003ctd\u003e6–9.8\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2013–2016 catalog examples\u003c\/td\u003e\n\u003ctd\u003e350-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM9.9 \/ 15D2 \/ 18E2 \/ MX18E2\u003c\/td\u003e\n\u003ctd\u003e9.9–18\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2013–2015 catalog examples\u003c\/td\u003e\n\u003ctd\u003e350-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eM25\/30H\/JET\u003c\/td\u003e\n\u003ctd\u003e25–30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2025–2026 catalog examples\u003c\/td\u003e\n\u003ctd\u003e345-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMX25\/30H\u003c\/td\u003e\n\u003ctd\u003e25–30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e2025–2026 catalog examples\u003c\/td\u003e\n\u003ctd\u003e345-01030-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS2 \/ MFS2.5 \/ MFS3.5B\u003c\/td\u003e\n\u003ctd\u003e2–3.5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2013–2017 catalog examples\u003c\/td\u003e\n\u003ctd\u003e3H6-01030-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS4 \/ MFS5 \/ MFS6C\u003c\/td\u003e\n\u003ctd\u003e4–6\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2013–2017 catalog examples\u003c\/td\u003e\n\u003ctd\u003e3H6-01030-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003eAdditional applications may exist under the reference numbers above. Model names, production years, and serial-number ranges can vary by market and engine revision, so verify against the engine's identification plate and the applicable parts diagram.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n\u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat kit\u003c\/dd\u003e\n\u003cdt\u003eThermostat Rating\u003c\/dt\u003e\n\u003cdd\u003e50°C (122°F)\u003c\/dd\u003e\n\u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eSelected Tohatsu and Nissan 2-stroke and 4-stroke outboard motors\u003c\/dd\u003e\n\u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eReplacement installation using the original thermostat housing\u003c\/dd\u003e\n\u003cdt\u003eIncluded Components\u003c\/dt\u003e\n\u003cdd\u003eThermostat, housing gasket, and thermostat seals\u003c\/dd\u003e\n\u003cdt\u003eProduct Status\u003c\/dt\u003e\n\u003cdd\u003eAftermarket replacement; not an OEM-branded component\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;\"\u003e1x\u003c\/span\u003e 50°C (122°F) thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1x\u003c\/span\u003e thermostat housing gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2x\u003c\/span\u003e thermostat seals\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\u003eAllow the engine to cool completely before beginning work. Follow the engine manufacturer's safety procedures.\u003c\/li\u003e\n\u003cli\u003eLocate the thermostat housing and place a suitable drain pan below the work area to collect water or coolant released during disassembly.\u003c\/li\u003e\n\u003cli\u003eRemove the housing cover carefully and note the orientation of the old thermostat, gasket, and seals.\u003c\/li\u003e\n\u003cli\u003eClean the mating surfaces and remove old gasket material without damaging the housing or cover.\u003c\/li\u003e\n\u003cli\u003eInstall the new thermostat in the same orientation as the original, then fit the supplied gasket and seals.\u003c\/li\u003e\n\u003cli\u003eReinstall the housing cover and tighten the fasteners evenly to the manufacturer's specified torque.\u003c\/li\u003e\n\u003cli\u003eRestore the cooling system as required for the engine, run the outboard according to the service instructions, and check for leaks and normal water flow.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eDo not substitute automotive coolant procedures for the outboard manufacturer's service procedure. Use the correct fluid and bleeding or flushing method for your specific engine.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are common signs of a failed thermostat?\u003c\/summary\u003e\n\u003cp\u003ePossible symptoms include overheating, unusually low operating temperature, inconsistent temperature behavior, or poor cooling-system performance. Blocked water passages, a damaged water pump, or other cooling-system faults can cause similar symptoms.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat temperature is this thermostat rated for?\u003c\/summary\u003e\n\u003cp\u003eThis kit is listed with a 50°C (122°F) thermostat rating.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm fitment?\u003c\/summary\u003e\n\u003cp\u003eCompare your original manufacturer reference with the Part Number Matrix, then verify the engine brand, exact model, horsepower, stroke, production year, and serial-number range in the applicable parts diagram. Do not rely on horsepower alone.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the kit include the service gaskets and seals?\u003c\/summary\u003e\n\u003cp\u003eYes. The listed kit contents are one thermostat, one thermostat housing gasket, and two thermostat seals.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n\u003cp\u003eNo. This is an aftermarket replacement kit intended for the documented manufacturer reference numbers and applications listed on this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs there a fixed replacement interval?\u003c\/summary\u003e\n\u003cp\u003eFollow the maintenance schedule for your specific outboard. Inspect the thermostat when diagnosing cooling-system problems or when the thermostat housing is opened for related service.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWork only on a cool engine and follow the manufacturer's service and safety instructions.\u003c\/li\u003e\n\u003cli\u003eConfirm the exact model, year, stroke, and serial-number range before purchase.\u003c\/li\u003e\n\u003cli\u003eCompare the supplied part and sealing components with the original before installation.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended when the correct procedure or torque specifications are unavailable.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM-branded component.\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\u003eMarine replacement parts selected for documented applications and practical service needs.\u003c\/li\u003e\n\u003cli\u003eClear reference-number and fitment information to help support accurate part selection.\u003c\/li\u003e\n\u003cli\u003eCustomer support is available for installation and fitment questions when complete engine details are provided.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718270521659,"sku":"QM-345-01030","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/QM-345-01030.png?v=1762958708"},{"product_id":"carburetor-fits-mercury-tohatsu-nissan-2-6-hp-replaces-3r1-03200-1-853720t25","title":"Aftermarket Carburetor for Mercury, Mariner, Tohatsu \u0026 Nissan 2–6 HP 4-Stroke Outboards – Replaces 3R1-03200-1, 853720T25","description":"\u003csection\u003e\n\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 { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003ecarburetor for Mercury, Mariner, Tohatsu, and Nissan 2–6 HP 4-stroke outboards\u003c\/strong\u003e is designed as a replacement for engines that use the applicable part numbers listed below. A properly matched replacement carburetor helps restore consistent fuel delivery, starting performance, idle quality, and throttle response.\u003c\/p\u003e\n\u003cp\u003eThis carburetor is listed as an interchange for Mercury part numbers \u003cstrong\u003e853720T25\u003c\/strong\u003e and \u003cstrong\u003e803819T03\u003c\/strong\u003e, and for Tohatsu and Nissan references \u003cstrong\u003e3R1-03200-1\u003c\/strong\u003e, \u003cstrong\u003e3AS-03200-0\u003c\/strong\u003e, and \u003cstrong\u003e3GV-03200-0\u003c\/strong\u003e. Confirm the number on your original carburetor and compare the mounting arrangement before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAftermarket replacement for selected small 4-stroke outboard applications.\u003c\/li\u003e\n  \u003cli\u003eDesigned for direct replacement where the original part number and configuration match.\u003c\/li\u003e\n  \u003cli\u003eSupports consistent air-and-fuel delivery for normal engine operation.\u003c\/li\u003e\n  \u003cli\u003eSuitable for gasoline-fueled outboard engines within the listed application range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the following references to help compare the replacement with your original carburetor. Part-number matching is recommended because model, production year, serial number, and configuration can affect fitment.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e853720T25\u003c\/td\u003e\n\u003ctd\u003eListed replacement reference; also associated with 803819T03.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e803819T03\u003c\/td\u003e\n\u003ctd\u003eAdditional replacement reference.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003ctd\u003eListed replacement reference; also associated with 3AS-03200-0 and 3GV-03200-0.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e3AS-03200-0\u003c\/td\u003e\n\u003ctd\u003eAdditional replacement reference.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu \/ Nissan\u003c\/td\u003e\n\u003ctd\u003e3GV-03200-0\u003c\/td\u003e\n\u003ctd\u003eAdditional replacement 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\u003eThis replacement is intended for selected \u003cstrong\u003e2–6 HP 4-stroke\u003c\/strong\u003e Mercury, Mariner, Tohatsu, and Nissan outboards. The application examples below are provided as a guide only. Verify the original carburetor part number, mounting pattern, linkage arrangement, fuel connections, and engine identification before purchase.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel or Application\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eApplicable Reference\u003c\/th\u003e\n\u003cth\u003eFitment Note\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003eSelected small outboard applications\u003c\/td\u003e\n\u003ctd\u003e2–6 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e853720T25 \/ 803819T03\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number and configuration.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMF3.5\u003c\/td\u003e\n\u003ctd\u003e3.5 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS4\u003c\/td\u003e\n\u003ctd\u003e4 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS5\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNFS4\u003c\/td\u003e\n\u003ctd\u003e4 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNFS5\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003ctd\u003eConfirm the original part number before ordering.\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The table does not establish fitment for every engine in a horsepower or model family. Year, serial-number range, carburetor design, and linkage configuration may vary. Do not use this part on a 2-stroke engine.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eAftermarket carburetor assembly\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eSelected Mercury, Mariner, Tohatsu, and Nissan 2–6 HP 4-stroke outboards\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement where the original part number and configuration match\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eDirect-mount replacement design\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eMetal alloy construction\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\/metallic\u003c\/dd\u003e\n  \u003cdt\u003eReplacement References\u003c\/dt\u003e\n\u003cdd\u003e853720T25, 803819T03, 3R1-03200-1, 3AS-03200-0, and 3GV-03200-0\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Carburetor assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e The mounting gasket and any other installation hardware are not included unless specifically shown or stated in the product package. Reuse of an old gasket is not recommended if it is worn, compressed, cracked, or damaged.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eTurn off the engine, allow it to cool, and follow the applicable service-manual safety procedures. Disconnect the fuel supply before beginning work.\u003c\/li\u003e\n  \u003cli\u003eRemove the engine cowling and document the routing of all hoses, wires, and linkages before removing the original carburetor.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the throttle or choke linkage and fuel hose carefully. Prevent dirt from entering the intake or fuel system.\u003c\/li\u003e\n  \u003cli\u003eRemove the mounting fasteners and old carburetor. Clean the mounting surface without allowing debris to enter the engine.\u003c\/li\u003e\n  \u003cli\u003eInstall the replacement using a suitable new gasket if required. Tighten the fasteners evenly to the engine manufacturer’s specified torque.\u003c\/li\u003e\n  \u003cli\u003eReconnect every hose and linkage in its original position. Confirm that the throttle and choke operate freely without binding.\u003c\/li\u003e\n  \u003cli\u003eReconnect the fuel supply, prime the system as applicable, and inspect for leaks before starting the engine.\u003c\/li\u003e\n  \u003cli\u003eStart and test the engine in a safe, properly ventilated environment. Follow the manufacturer’s adjustment and break-in procedures if applicable.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if my carburetor may need replacement?\u003c\/summary\u003e\u003cp\u003eHard starting, unstable idle, stalling, poor acceleration, fuel leakage, or abnormal exhaust smoke can have several causes, including contaminated fuel, restricted passages, ignition problems, or incorrect adjustment. Diagnose the fuel and ignition systems before replacing the carburetor.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this carburetor fit a 2-stroke outboard?\u003c\/summary\u003e\u003cp\u003eNo. This listing is for selected 4-stroke applications. It should not be installed on a 2-stroke engine.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow can I confirm fitment?\u003c\/summary\u003e\u003cp\u003eCompare the number on your original carburetor with the listed references, then compare the mounting points, fuel connections, linkage, and overall appearance. Also verify the engine brand, model, horsepower, stroke, and any available serial-number information.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes the package include a mounting gasket?\u003c\/summary\u003e\u003cp\u003eNo. The package includes the carburetor assembly only. A suitable mounting gasket should be obtained separately when required.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill adjustment be required after installation?\u003c\/summary\u003e\u003cp\u003eAdjustment requirements depend on the engine and the replacement assembly. Follow the engine manufacturer’s service instructions, and do not change mixture or idle settings beyond the manufacturer’s specifications.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between an OEM and an aftermarket part?\u003c\/summary\u003e\u003cp\u003eThis is an aftermarket replacement, not an original manufacturer part. Confirm the part number and physical configuration before installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow should the fuel system be maintained?\u003c\/summary\u003e\u003cp\u003eUse clean, fresh fuel, keep water and debris out of the fuel system, follow the engine manufacturer’s storage procedure, and inspect fuel lines and filters regularly. Stabilize or drain fuel as recommended for seasonal storage.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the original part number and physical configuration before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on horsepower alone to determine compatibility; model, year, serial range, stroke, and configuration may affect fitment.\u003c\/li\u003e\n  \u003cli\u003eUse the correct gasket and installation torque for your engine.\u003c\/li\u003e\n  \u003cli\u003eCheck carefully for fuel leaks before operating the engine.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended if you are unfamiliar with outboard fuel systems.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement part, not an OEM component.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts:\u003c\/strong\u003e We provide replacement components for a range of recreational and commercial marine applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment-Focused Listings:\u003c\/strong\u003e Product references and application information are provided to help customers compare replacement parts with their original components.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupport:\u003c\/strong\u003e If you are unsure about compatibility, compare your original part and engine identification information before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723790553403,"sku":"3R14BbxYGGG","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/3R14BbxYGGG.png?v=1763031866"},{"product_id":"carburetor-fits-mercury-mariner-2-6-hp-tohatsu-nissan-mfs-nfs-3-5-6-hp-4-stroke-outboards-replaces-3r1-03200-1-853720t25","title":"Carburetor for Mercury\/Mariner 2.5–6 HP and Tohatsu\/Nissan MFS\/NFS 3.5–6 HP 4-Stroke Outboards — Replaces 3R1-03200-1 and 853720T25","description":"\u003csection\u003e\n\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 { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket replacement \u003cstrong\u003ecarburetor assembly\u003c\/strong\u003e is designed for selected Mercury and Mariner 4-stroke outboards from 2.5 to 6 HP, as well as selected Tohatsu and Nissan MFS\/NFS 4-stroke models from 3.5 to 6 HP. It is intended to restore proper fuel metering and dependable engine operation when the original carburetor is worn, contaminated, damaged, or leaking.\u003c\/p\u003e\n\u003cp\u003eThis carburetor is listed as a replacement for several manufacturer part numbers, including Mercury\/Mariner 853720T25, 8M0053670, 803522T03, and Tohatsu\/Nissan 3R1-03200-1. Confirm the model, horsepower, stroke type, engine serial range, mounting arrangement, and part number of your original carburetor before ordering.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDirect OEM-style replacement for the listed applications.\u003c\/li\u003e\n\u003cli\u003eMetal die-cast housing designed for use in marine environments.\u003c\/li\u003e\n\u003cli\u003eHelps provide the correct air-fuel mixture for starting, idling, acceleration, and normal operation.\u003c\/li\u003e\n\u003cli\u003eVerify the original part and mounting details before installation; model and year variations may exist.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThe following numbers are listed as replacement or reference numbers for this carburetor. They are not the internal product identifier.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e803522T1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e803522T2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e803522T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e803522T04\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e803522T05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e803522T06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e803522A04\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e8M0053670\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e853720T25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e898103T51\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e889246T10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\/Nissan\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\/Nissan\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\/Nissan\u003c\/td\u003e\n\u003ctd\u003e3AS-03200-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\/Nissan\u003c\/td\u003e\n\u003ctd\u003e3GV-03200-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003ch2\u003eEngine and Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eUse the following applications as a reference. Always compare the engine identification label and the existing carburetor before purchase.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\u003ctable class=\"ss-table\" aria-label=\"Mercury and Mariner Model Compatibility\"\u003e\n\u003cthead\u003e\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\u003eReference Part No.\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eF2.5\/2.5M\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e853720T25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eF3.5\/3.5M\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e853720T25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eF4\/4M\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e803522T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eF5\/5M\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e803522T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eF6\/6M\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e803522T03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp\u003eSelected Tohatsu and Nissan MFS\/NFS 4-stroke outboards in the 3.5–6 HP range are also listed for this replacement. The model and part-number references below should be checked against the engine identification and original component.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\u003ctable class=\"ss-table\" aria-label=\"Tohatsu and Nissan Model Compatibility\"\u003e\n\u003cthead\u003e\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\u003eReference Part No.\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMF3.5\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS5\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNFS4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eNFS5\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3R1-03200-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n\u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eCarburetor assembly\u003c\/dd\u003e\n\u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eSelected 4-stroke marine outboards\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\u003eIntake manifold mount\u003c\/dd\u003e\n\u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eMetal, die-cast aluminum\u003c\/dd\u003e\n\u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\/machined\u003c\/dd\u003e\n\u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eReplacement flange\u003c\/dd\u003e\n\u003cdt\u003eFunction\u003c\/dt\u003e\n\u003cdd\u003eFuel and air metering for smooth combustion and reliable engine operation\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Carburetor assembly\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eAllow the engine to cool, shut off the fuel supply, and follow the engine manufacturer's safety procedures.\u003c\/li\u003e\n\u003cli\u003ePlace an absorbent rag below the carburetor to catch spilled fuel.\u003c\/li\u003e\n\u003cli\u003eDisconnect the fuel line and any applicable electrical connections.\u003c\/li\u003e\n\u003cli\u003eRemove the airbox cover and air filter assembly as necessary for access.\u003c\/li\u003e\n\u003cli\u003eDisconnect the throttle and choke linkages, noting their original positions.\u003c\/li\u003e\n\u003cli\u003eRemove the fasteners securing the carburetor to the intake manifold.\u003c\/li\u003e\n\u003cli\u003eRemove the old carburetor without damaging the intake surface or adjacent components.\u003c\/li\u003e\n\u003cli\u003eClean the mounting surface and remove old gasket material and debris.\u003c\/li\u003e\n\u003cli\u003eInstall the replacement carburetor with the correct gasket and tighten the fasteners evenly to the manufacturer's specification.\u003c\/li\u003e\n\u003cli\u003eReconnect the linkages, fuel line, airbox, and other removed components.\u003c\/li\u003e\n\u003cli\u003eTurn on the fuel supply, prime the system if required, and inspect carefully for leaks before starting.\u003c\/li\u003e\n\u003cli\u003eStart and run the engine in a safe, well-ventilated area while checking idle and throttle response.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting and FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm fitment?\u003c\/summary\u003e\u003cp\u003eCompare the engine brand, exact model, horsepower, 4-stroke designation, serial information, mounting arrangement, and original carburetor part number with the information above. A visual comparison of the replacement and original components is also recommended. If any important detail differs, do not install the part without further confirmation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are common signs of a failing carburetor?\u003c\/summary\u003e\u003cp\u003eSymptoms may include hard starting, rough or unstable idle, stalling at low speed, poor acceleration, increased fuel consumption, black exhaust smoke, or fuel leakage around the carburetor.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill adjustment be required after installation?\u003c\/summary\u003e\u003cp\u003eThis is intended as a direct-fit replacement, but idle speed or mixture adjustment may be required depending on the engine, fuel condition, operating altitude, and installation. Follow the engine manufacturer's adjustment procedure.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow should the carburetor be maintained?\u003c\/summary\u003e\u003cp\u003eUse fresh fuel and an appropriate stabilizer when required. Inspect fuel lines and connections regularly for deterioration or leaks. For extended storage, follow the engine manufacturer's procedure for draining or stabilizing the fuel system.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\u003cp\u003eThis listing is for an aftermarket replacement carburetor, not an original equipment manufacturer component.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the shipping and warranty terms?\u003c\/summary\u003e\u003cp\u003eShipping availability, delivery estimates, warranty coverage, and return conditions are determined by the applicable order and store policies. Review the current policy information at checkout or contact support before ordering if these terms are important to your purchase.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch2\u003eSafety and Important Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGasoline is flammable. Work in a well-ventilated area away from ignition sources.\u003c\/li\u003e\n\u003cli\u003eVerify the engine model, horsepower, stroke type, serial information, and original part before purchase.\u003c\/li\u003e\n\u003cli\u003eDo not operate the engine if fuel leaks are present.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended when you are not familiar with marine fuel systems.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — Marine replacement parts selected for dependable service in real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Fulfillment\u003c\/strong\u003e — Shipping options and delivery estimates are shown according to the destination and current order terms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Practical replacement solutions with attention to fit, materials, and quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723790586171,"sku":"1A-NJHV-44RU","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/1A-NJHV-44RU.png?v=1763031868"},{"product_id":"water-pump-impeller-repair-kit-fits-mercury-tohatsu-2-3-5-hp-replaces-16159a2-8m0080264-3ab-87322-0","title":"Water Pump Repair Kit for Mercury 3.3 HP 2-Stroke and Tohatsu MFS2–MFS3.5 4-Stroke Outboards – Replaces 16159A2, 8M0080264 and 3AB-87322-0","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 { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003eWater Pump Repair Kit\u003c\/strong\u003e is an aftermarket replacement for selected small Mercury and Tohatsu outboard water-pump assemblies. Catalog references identify the Mercury application around 3.3 HP 2-stroke outboards, including shiftable engines, and the Tohatsu application for MFS2, MFS2.5 and MFS3.5B\/C 4-stroke models. Always match the complete OEM part number and engine serial or model information before ordering.\u003c\/p\u003e\n  \u003cp\u003eThe kit is intended to replace water-pump service components associated with Mercury references \u003cstrong\u003e16159A2\u003c\/strong\u003e, \u003cstrong\u003e8M0080264\u003c\/strong\u003e and \u003cstrong\u003e889246A16\u003c\/strong\u003e, together with Tohatsu reference \u003cstrong\u003e3AB-87322-0\u003c\/strong\u003e. The listed numbers are manufacturer or OEM reference numbers only; this product is not an OEM-branded part.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eReplacement water-pump service kit for selected small outboards.\u003c\/li\u003e\n    \u003cli\u003eDesigned for servicing the impeller, wear surfaces and associated gaskets in the applicable pump assembly.\u003c\/li\u003e\n    \u003cli\u003eIncludes a six-blade impeller with a nylon hub.\u003c\/li\u003e\n    \u003cli\u003eConfirm the reference number, engine model, stroke, year and serial range before installation.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse the following references to compare the required water-pump repair kit with your original part or service-manual listing.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n      \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eManufacturer or OEM Reference\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mercury Mariner\u003c\/td\u003e\n\u003ctd\u003e16159A2\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mercury Mariner\u003c\/td\u003e\n\u003ctd\u003e47-16159A2\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mercury Mariner\u003c\/td\u003e\n\u003ctd\u003e8M0080264\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mercury Mariner\u003c\/td\u003e\n\u003ctd\u003e47-8M0080264\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mercury Mariner\u003c\/td\u003e\n\u003ctd\u003e889246A16\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mercury Mariner\u003c\/td\u003e\n\u003ctd\u003e47-889246A16\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3AB-87322-0\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3AB873220M\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3F0-87322-1\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e3F0873221M\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eEngine and Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eFitment depends on the complete engine configuration. Model, horsepower, stroke and serial conditions must be checked together; a matching horsepower alone does not confirm compatibility.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel or Application\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYear or Serial Condition\u003c\/th\u003e\n\u003cth\u003eReference\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\u003e3.3 HP outboard\u003c\/td\u003e\n          \u003ctd\u003e3.3 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e0D901217 through 0G710612\u003c\/td\u003e\n          \u003ctd\u003e8M0080264\u003c\/td\u003e\n          \u003ctd\u003eCatalog occurrence identifies shiftable engines.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e3.3 HP outboard\u003c\/td\u003e\n          \u003ctd\u003e3.3 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e0G710613 through 0T894576\u003c\/td\u003e\n          \u003ctd\u003e8M0080264\u003c\/td\u003e\n          \u003ctd\u003eVerify the exact serial number and pump configuration.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e3.3 HP outboard\u003c\/td\u003e\n          \u003ctd\u003e3.3 HP\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e0T894577 and up\u003c\/td\u003e\n          \u003ctd\u003e8M0080264\u003c\/td\u003e\n          \u003ctd\u003eVerify the exact serial number and pump configuration.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eTohatsu\u003c\/td\u003e\n          \u003ctd\u003eMFS2 \/ MFS2.5 \/ MFS3.5B\u003c\/td\u003e\n          \u003ctd\u003e2–3.5 HP\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2016–2019 catalog applications\u003c\/td\u003e\n          \u003ctd\u003e3AB-87322-0\u003c\/td\u003e\n          \u003ctd\u003eCheck the model suffix and service-manual listing.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eTohatsu\u003c\/td\u003e\n          \u003ctd\u003eMFS2 \/ MFS2.5 \/ MFS3.5C\u003c\/td\u003e\n          \u003ctd\u003e2–3.5 HP\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e2019–2026 catalog applications\u003c\/td\u003e\n          \u003ctd\u003e3AB-87322-0\u003c\/td\u003e\n          \u003ctd\u003eCheck the model suffix and service-manual listing.\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The catalog references above are application leads, not a substitute for checking the original part. Mercury and Tohatsu\/Nissan model naming, serial breaks and pump designs can vary by production year and market.\u003c\/p\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n    \u003cdd\u003eWater pump repair kit\u003c\/dd\u003e\n    \u003cdt\u003eApplication\u003c\/dt\u003e\n    \u003cdd\u003eSelected Mercury and Tohatsu small outboard water-pump assemblies\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n    \u003cdd\u003eDirect replacement service components; professional installation is recommended\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n    \u003cdd\u003eMarine-grade CR neoprene\u003c\/dd\u003e\n    \u003cdt\u003eWear Plate and Liner Material\u003c\/dt\u003e\n    \u003cdd\u003eSS316 stainless steel\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Dimensions\u003c\/dt\u003e\n    \u003cdd\u003eHeight: 14.35 mm (0.56 in); overall diameter: 33.6 mm (1.32 in); hub shaft diameter: 10.4 mm (0.41 in)\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n    \u003cdd\u003e57 g (2.01 oz)\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Design\u003c\/dt\u003e\n    \u003cdd\u003eSix-blade impeller with nylon hub\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Water pump impeller (47-161543)\u003c\/li\u003e\n    \u003cli\u003e1 x Impeller pin (28-16155)\u003c\/li\u003e\n    \u003cli\u003e1 x Housing gasket (27-898101331)\u003c\/li\u003e\n    \u003cli\u003e1 x Wear plate gasket (27-898101332)\u003c\/li\u003e\n    \u003cli\u003e1 x Wear plate (898101371)\u003c\/li\u003e\n    \u003cli\u003e1 x Insert cup (161571)\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003ePart numbers in the package list are component or reference numbers and may differ from the package's primary application number. Compare the components with the parts removed from your engine before installation.\u003c\/p\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eMake sure the engine is stopped, cool and secured. Disconnect the battery where applicable and follow the engine manufacturer's safety instructions.\u003c\/li\u003e\n    \u003cli\u003eRemove the gearcase or lower unit according to the applicable service manual.\u003c\/li\u003e\n    \u003cli\u003eRemove the water-pump housing and note the original impeller-vane direction and component order.\u003c\/li\u003e\n    \u003cli\u003eRemove the old impeller, pin or key, wear plate and gaskets. Clean the mating surfaces without damaging the housing or driveshaft.\u003c\/li\u003e\n    \u003cli\u003eInstall the replacement wear plate and gaskets in the same orientation as the original components.\u003c\/li\u003e\n    \u003cli\u003eFit the new impeller onto the driveshaft, align the key or pin, and rotate the driveshaft in its normal operating direction while lowering the housing so the vanes seat correctly.\u003c\/li\u003e\n    \u003cli\u003eFasten the pump housing using the manufacturer's specified hardware and torque procedure.\u003c\/li\u003e\n    \u003cli\u003eReinstall the lower unit, ensuring correct alignment of the driveshaft, shift shaft and water tube where applicable.\u003c\/li\u003e\n    \u003cli\u003eRun the engine only in water or with an appropriate flushing attachment. Confirm cooling-water flow and check for leaks before normal operation.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\n  \u003ch2\u003eTroubleshooting and FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow can I confirm that this kit fits my outboard?\u003c\/summary\u003e\n    \u003cp\u003eCompare the complete OEM reference, engine brand, model, horsepower, stroke and serial or year condition. For Mercury applications, the catalog references center on selected 3.3 HP 2-stroke engines. For Tohatsu applications, reference 3AB-87322-0 is associated with selected MFS2, MFS2.5 and MFS3.5B\/C 4-stroke models. If any detail differs, confirm the required kit with the engine service manual or a qualified marine dealer.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are common signs of a worn water-pump impeller?\u003c\/summary\u003e\n    \u003cp\u003ePossible signs include weak or intermittent tell-tale flow, overheating at idle or low speed, reduced cooling-water output, or an impeller that is cracked, brittle, deformed or missing vane material during inspection.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eInspect the water-pump impeller according to the engine manufacturer's maintenance schedule. Service intervals depend on operating hours, storage conditions and whether the engine is used in saltwater, sand or silty water. Replace it sooner if damage or overheating symptoms are present.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use this kit if my serial number is outside the listed range?\u003c\/summary\u003e\n    \u003cp\u003eDo not assume fitment from horsepower alone. Serial-number changes can correspond to different gearcase or water-pump components. Check the complete original part number and the applicable service-manual diagram before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is an aftermarket replacement kit intended to interchange with the manufacturer references listed on this page. Mercury, Mariner and Tohatsu reference numbers are used only for identification and compatibility comparison.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the shipping options?\u003c\/summary\u003e\n    \u003cp\u003eAvailable shipping methods and delivery estimates are shown at checkout and may vary by destination, carrier and inventory location.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n    \u003cp\u003eWarranty coverage and returns are governed by the seller's current policy. Contact customer support before returning a product and keep the order information and original packaging available.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003ch2\u003eSafety and Important Information\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify the original part, engine model, stroke, year and serial range before purchase.\u003c\/li\u003e\n    \u003cli\u003eDo not operate an outboard without an adequate cooling-water supply.\u003c\/li\u003e\n    \u003cli\u003eStop operation immediately if the engine overheats or cooling-water flow is weak or absent.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended if you are not familiar with lower-unit or water-pump service.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Practical replacement components for selected outboard service applications.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFitment-Focused Information\u003c\/strong\u003e — Reference numbers and application details are provided to support careful part comparison.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGlobal Fulfillment\u003c\/strong\u003e — Shipping availability and delivery estimates are presented at checkout for the destination entered.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723791831355,"sku":"24KM315-QM","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/24KM315-QM.png?v=1763031895"}],"url":"https:\/\/seasierra.com\/collections\/tohatsu-4-stroke-2-5hp-outboard-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}