{"title":"Mercury 2-Stroke Outboard Motor 90-120HP","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;\"\u003e\n  \u003cp\u003eThis page is for Mercury 2‑Stroke 90–120HP outboard engines. Use it to quickly find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection any time. 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 results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;padding:10px 16px;background:#0b5cab;color:#fff;text-decoration:none;border-radius:6px;\"\u003eBrowse All Mercury Parts\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 90–120HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eFind the serial number plate on the transom bracket (often starboard side) or swivel bracket. Note the full serial and any model descriptors.\u003c\/li\u003e\n    \u003cli\u003eMercury two‑strokes rely primarily on the serial number for parts lookup; suffixes may indicate shaft length, starting\/charging equipment, or region.\u003c\/li\u003e\n    \u003cli\u003ePlatform clues: many 90HP two‑strokes are inline‑3, while 100–115HP are commonly inline‑4 “2+2” carbureted models. Inline‑4 motors typically lack a removable cylinder head casting.\u003c\/li\u003e\n    \u003cli\u003eIf your engine is labeled 120HP with a removable cylinder head, confirm whether it is a Force 120 sold under Mercury branding. If so, use \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\u003c\/a\u003e for best compatibility.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"platforms\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003eInline‑3 (approx. 90HP) 2‑Stroke\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eInline‑3, carbureted 2‑stroke outboard\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e90HP 2‑Stroke inline‑3 variants (mid‑1990s into 2000s in many markets)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eCompact, light weight, simple carburetion, good mid‑range torque\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eRoutine parts (impellers, plugs, filters, anodes) are widely supported; confirm serial for ignition, carb, and gearcase specifics.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eInline‑4 “2+2” (approx. 100–115HP) 2‑Stroke\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eInline‑4, carbureted 2‑stroke with “2+2” operation (two cylinders transition onto the main circuit as RPM rises)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e100\/115HP 2‑Stroke inline‑4 (same family also produced 125HP in many years)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eStrong mid‑range, straightforward service, broad parts availability\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eVerify serial for carburetor style and ignition (e.g., Thunderbolt\/CDM). Many used a 2.07:1 gearcase; always confirm before ordering seals\/gears.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003cp style=\"margin-top:8px;\"\u003eNote: Genuine Mercury‑branded 120HP two‑stroke models are uncommon; many 1990s “120” engines are Force 120 and use Force‑specific parts. When in doubt, compare the serial plate and consult \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines; always follow the service procedures and schedules in your official Mercury manual for your exact serial range.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd\u003eCheck for water\/metal; reseal if contamination is found.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd\u003eInspect 50 hrs; replace 100 hrs\u003c\/td\u003e\n        \u003ctd\u003eUse the correct heat range and gap; replace if fouled or worn.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark plug\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eFuel filter \/ in‑line filter\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd\u003eReplace sooner for contaminated fuel or storage issues.\u003c\/td\u003e\n        \u003ctd\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\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs or 1–2 seasons\u003c\/td\u003e\n        \u003ctd\u003eEssential for cooling; replace sooner if telltale is weak or after sand\/silt use.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAnodes\u003c\/td\u003e\n        \u003ctd\u003eInspect 50 hrs; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd\u003eProtects against corrosion; match water type (fresh\/brackish\/salt).\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePropeller \u0026amp; hardware\u003c\/td\u003e\n        \u003ctd\u003eInspect before trips; remove seasonally\u003c\/td\u003e\n        \u003ctd\u003eCheck for fishing line at the seals; verify hub integrity and cotter hardware.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOil‑injection system (if equipped)\u003c\/td\u003e\n        \u003ctd\u003eAnnually\u003c\/td\u003e\n        \u003ctd\u003eInspect\/replace brittle hoses, filters and clamps; bleed per manual after service.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\"\u003eHoses\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service: \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\"\u003eMercury Outboard Parts\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System: \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair 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 and \u003ca href=\"https:\/\/seasierra.com\/collections\/carburetor\"\u003eCarburetor\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical: \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \u0026amp; Seals: \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers \u0026amp; Hardware: \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection \u0026amp; Accessories: \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/boat-accessories\"\u003eBoat Accessories\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eWeak telltale or overheat alarm\u003c\/td\u003e\n        \u003ctd\u003eInspect intake screens, verify impeller condition, confirm thermostat operation.\u003c\/td\u003e\n        \u003ctd\u003eWater pump kit, intake screen, thermostat, anodes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd\u003eCheck fuel quality, filters, carb cleanliness\/sync; verify spark on all cylinders.\u003c\/td\u003e\n        \u003ctd\u003eFuel filter, carburetor kit, spark plugs, reeds\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd\u003eInspect primer bulb and lines for air leaks; check choke\/enrichment and ignition timing.\u003c\/td\u003e\n        \u003ctd\u003eFuel lines\/hoses, carburetor components, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eExcessive smoke (2‑Stroke)\u003c\/td\u003e\n        \u003ctd\u003eConfirm correct oil ratio or oil‑injection operation; verify plug heat range.\u003c\/td\u003e\n        \u003ctd\u003eOil lines, spark plugs, fuel\/oil filter\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd\u003eDrain and inspect oil; pressure\/vacuum test the case; verify prop shaft seals.\u003c\/td\u003e\n        \u003ctd\u003eLower unit seal kit, bearings, prop hardware\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;max-width:1100px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable across 90–120HP Mercury two‑stroke models?\u003c\/summary\u003e\n    \u003cp\u003eSome routine items overlap, but ignition, carburetion, and gearcase details vary by platform and serial range. Confirm the serial number and cylinder configuration (inline‑3 vs inline‑4) before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule, every 100 hours or 1–2 seasons, and sooner after sand\/silt use or if the telltale weakens. A fresh impeller is inexpensive insurance against overheating.\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\u003eAt least annually or every 100 hours. Inspect for water (milky oil) or metal. If contamination is found, service seals before returning to use.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eI have a 120HP with a removable cylinder head—do I use Mercury or Force parts?\u003c\/summary\u003e\n    \u003cp\u003eMany 1990s 120HP engines sold under the Mercury umbrella are Force 120 models. Match the serial plate; if it’s a Force, browse \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\u003c\/a\u003e for correct components.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Start in our main Mercury collection and use the Filter \u0026amp; Sort tools to narrow your results.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;padding:10px 16px;background:#0b5cab;color:#fff;text-decoration:none;border-radius:6px;\"\u003eShop Mercury Outboard Parts\u003c\/a\u003e\u003c\/p\u003e\n  \u003cp style=\"font-size:0.95em;color:#374151;\"\u003eIf you’re unsure about your model, send us a clear photo of the serial\/nameplate and the part you need—we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"thermostat-kit-130-f-55-c-fits-force-70-150-hp-replaces-f664068","title":"130°F Thermostat for Force Outboards and Mercury SportJet – Replaces F664068","description":"\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\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\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\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\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e130°F thermostat\u003c\/strong\u003e is an aftermarket replacement for specified Force outboard engines and Mercury SportJet applications. It is designed to help maintain the engine’s intended operating temperature and replaces the original thermostat identified by Force part number \u003cstrong\u003eF664068\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe company catalog identifies this product as a single thermostat rather than a multi-component kit. It is listed for selected Force 70–150 HP two-stroke applications, Mercury SportJet powerheads, and Force L-Drive models. Always compare the engine brand, horsepower, model year, and serial number with the fitment information before ordering.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThermostat rated at 130°F (approximately 54°C).\u003c\/li\u003e\n\u003cli\u003eAftermarket replacement for specified Force and Mercury Mariner applications.\u003c\/li\u003e\n\u003cli\u003eCustomer-facing cross-references include Force F664068, Mercury 859620, and Sierra 18-3527.\u003c\/li\u003e\n\u003cli\u003eSold as one thermostat; a gasket, cover gasket, housing, or other service parts are not confirmed as included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThese are the documented manufacturer and aftermarket reference numbers associated with this thermostat.\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\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eForce\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eReplacement reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e859620\u003c\/td\u003e\n        \u003ctd\u003eManufacturer reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3527\u003c\/td\u003e\n        \u003ctd\u003eAftermarket 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\u003eThe fitment below is grouped by engine family, horsepower, stroke, and year or serial condition. The thermostat is not confirmed for every engine within a horsepower range. Match the complete application details before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Force Outboard Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eApplication\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\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\u003eForce\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e70\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1991–1995\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eSpecified Force 70 HP application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eForce\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1996–1999\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eVerify the engine model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eForce\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e85\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1989\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eSpecified Force 85 HP application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eForce\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1991–1999\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eVerify the exact model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eForce\u003c\/td\u003e\n        \u003ctd\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e150\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1989–1994\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eSpecified Force 150 HP application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eForce\u003c\/td\u003e\n        \u003ctd\u003eL-Drive\u003c\/td\u003e\n        \u003ctd\u003e85–125\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1989–1994\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eListed for Force L-Drive applications; confirm the complete model designation.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eMercury SportJet Applications\u003c\/h3\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Mercury SportJet Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eApplication\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\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 SportJet\u003c\/td\u003e\n        \u003ctd\u003eJet-drive powerhead\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1995\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eSpecified 90 HP SportJet application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury SportJet\u003c\/td\u003e\n        \u003ctd\u003eJet-drive powerhead\u003c\/td\u003e\n        \u003ctd\u003e120\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1995–1998\u003c\/td\u003e\n        \u003ctd\u003eF664068\u003c\/td\u003e\n        \u003ctd\u003eSpecified 120 HP SportJet application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eSingle thermostat\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eReplacement thermostat for the original application\u003c\/dd\u003e\n  \u003cdt\u003eTemperature Rating\u003c\/dt\u003e\n  \u003cdd\u003e130°F \/ approximately 54°C\u003c\/dd\u003e\n  \u003cdt\u003ePrimary Replacement Reference\u003c\/dt\u003e\n  \u003cdd\u003eForce F664068\u003c\/dd\u003e\n  \u003cdt\u003eAdditional References\u003c\/dt\u003e\n  \u003cdd\u003eMercury 859620; Sierra 18-3527\u003c\/dd\u003e\n  \u003cdt\u003eApplication Type\u003c\/dt\u003e\n  \u003cdd\u003eSelected Force outboards, Force L-Drive models, and Mercury SportJet applications\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 Thermostat, 130°F \/ approximately 54°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA gasket or cover gasket is not confirmed as included. Reuse is not recommended unless the existing gasket is specifically approved for reuse; obtain any required sealing components separately for your exact engine.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eConfirm the engine model, horsepower, year, stroke, and serial number against the compatibility information before beginning work.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to cool completely and follow the manufacturer’s service procedure.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the battery or follow the applicable safety isolation procedure.\u003c\/li\u003e\n  \u003cli\u003eLocate the thermostat housing and place a suitable drain pan beneath the work area if water may be released when the housing is opened.\u003c\/li\u003e\n  \u003cli\u003eRemove the thermostat housing cover and note the orientation of the old thermostat.\u003c\/li\u003e\n  \u003cli\u003eRemove the old thermostat and inspect the housing, sealing surfaces, and related components for corrosion or damage.\u003c\/li\u003e\n  \u003cli\u003eClean the mating surfaces without gouging the housing.\u003c\/li\u003e\n  \u003cli\u003eInstall the new thermostat in the same orientation as the original part.\u003c\/li\u003e\n  \u003cli\u003eInstall a suitable new gasket or seal if required by the engine service procedure. The gasket is not confirmed as part of this product.\u003c\/li\u003e\n  \u003cli\u003eReinstall the housing cover and tighten the fasteners to the engine manufacturer’s specified torque.\u003c\/li\u003e\n  \u003cli\u003eRun the engine according to the service manual and check for leaks, proper cooling-water flow, and normal operating temperature.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if this thermostat fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eMatch the engine brand, application, horsepower, two-stroke configuration, and model year shown in the compatibility tables. For Force 75 HP and 90 HP applications, and for any model with multiple production versions, verify the exact model and serial number before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this a kit or a single thermostat?\u003c\/summary\u003e\n  \u003cp\u003eThe company product record identifies this item as a single thermostat, even though some catalog labels use the term “thermostat kit.” Only one thermostat is confirmed in the box. Gaskets and other service parts are not confirmed as included.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat temperature is this thermostat?\u003c\/summary\u003e\n  \u003cp\u003eThis thermostat is specified at 130°F, approximately 54°C. The Fahrenheit and Celsius figures are rounded equivalents.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a thermostat problem?\u003c\/summary\u003e\n  \u003cp\u003eA thermostat that remains open can allow the engine to run too cool, while one that remains closed can contribute to overheating. Abnormal temperature readings, an overheat warning, poor warm-up behavior, or restricted cooling-water flow should be diagnosed together with the water pump, passages, temperature sensor, and related components.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this thermostat include a gasket?\u003c\/summary\u003e\n  \u003cp\u003eNo gasket is confirmed as included with this product. Check the service parts for your exact engine and obtain the correct gasket or seal separately when required.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM thermostat?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is for an aftermarket replacement thermostat. It is intended to replace the documented original application references, but it is not represented as a genuine OEM-branded part.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should an outboard thermostat be inspected?\u003c\/summary\u003e\n  \u003cp\u003eInspection intervals depend on the engine manufacturer’s maintenance schedule and operating conditions. Inspect the thermostat when servicing the cooling system and whenever the engine shows abnormal temperature behavior. Replace it if it is corroded, damaged, stuck, or outside the manufacturer’s specifications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow fast is shipping and what does it cost?\u003c\/summary\u003e\n  \u003cp\u003eShipping availability, delivery estimates, and applicable charges are displayed at checkout based on the destination and selected service.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the complete engine application and compare the replacement thermostat with the original part before installation.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on horsepower alone when multiple model years or serial ranges exist.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not a genuine OEM-branded part.\u003c\/li\u003e\n  \u003cli\u003eWork only on a cool engine and follow the applicable manufacturer service manual.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended if you are not familiar with outboard cooling-system 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-Focused Parts\u003c\/strong\u003e — We supply replacement components for marine maintenance and repair applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Based Listings\u003c\/strong\u003e — Product information is organized around documented engine and part-number references.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupport for Correct Selection\u003c\/strong\u003e — Confirm the full model, year, horsepower, stroke, and serial conditions before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723982180667,"sku":"23TH016","price":35.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Thermostat_Kit_for_Force_70HP_75HP_85HP_90HP_120HP_125HP_150HP_1990_Thru_1999_F664068___F664068_-_JLM_MARINE-8291128.jpg?v=1763039301"}],"url":"https:\/\/seasierra.com\/collections\/mercury-2-stroke-outboard-motor-90-120hp.oembed","provider":"SeaSierra","version":"1.0","type":"link"}