{"title":"Force 2-Stroke 70-150HP Outboard Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"max-width: 1100px; margin: 0 auto; padding: 16px 12px;\"\u003e\n  \u003cp\u003e\n    This page is for Force 2-Stroke 70–150HP outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, common replacement items, and quick troubleshooting guidance. You can also browse the main Force collection. To begin shopping for this engine, scroll to the bottom of the page; on the collection page, use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category.\n  \u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\" style=\"display:inline-block; padding:10px 16px; background:#0b63ce; color:#fff; text-decoration:none; border-radius:6px;\"\u003eBrowse All Force Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width: 1100px; margin: 0 auto; padding: 8px 12px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 70–150HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the identification plate: typically on the transom clamp or swivel bracket; a duplicate serial may be stamped on a core\/freeze plug on the powerhead.\u003c\/li\u003e\n    \u003cli\u003eReading the model code: note the horsepower, shaft-length suffix (S\/L\/X), start\/trim options, and any year or revision letters. Match the full code when selecting parts.\u003c\/li\u003e\n    \u003cli\u003ePlatform cues for 2‑Stroke models: 70–90HP are commonly inline‑3 with three carburetors; 120–150HP are typically inline‑4 with four carburetors. Cowl shape and carb count can help distinguish platforms.\u003c\/li\u003e\n    \u003cli\u003eOil system: confirm whether your engine is premix or uses oil injection. Premix ratio and oiling hardware affect plug selection, fuel lines, and service parts.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"max-width: 1100px; margin: 0 auto; padding: 8px 12px;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003eInline‑3 2‑Stroke (approx. 70–90HP)\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 #ddd; padding:6px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:6px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eInline‑3, carbureted 2‑stroke with mechanical fuel system\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003e70, 85, 90 HP inline‑3 Force 2‑stroke models (late ’80s–’90s)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eLight weight, simple carburation, responsive mid‑range\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eVerify carb synchronization and cooling service parts by model code; ignition components may vary by year—confirm before ordering.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eInline‑4 2‑Stroke (approx. 120–150HP)\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 #ddd; padding:6px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:6px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eInline‑4, carbureted 2‑stroke; conventional reed‑valve induction\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003e120, 125, 150 HP inline‑4 Force 2‑stroke models (late ’80s–’90s)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eStrong thrust for bigger hulls, straightforward service, widely supported wear parts\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eProp pitch and cooling condition have a large effect on performance; confirm lower‑unit and ignition part compatibility by model and year.\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=\"max-width: 1100px; margin: 0 auto; padding: 8px 12px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for 2‑stroke outboards. Always follow your official service manual and local operating conditions.\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 #ddd; padding:6px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:6px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:6px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:6px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eInspect for water (milky oil) and metal; reseal if contamination is present.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-lower-unit-seal-kits\"\u003eForce Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eInspect 50 hrs; replace 100 hrs or yearly\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eUse the correct heat range and gap; oiling and idle setup affect plug life.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; 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:6px; border-bottom:1px solid #eee;\"\u003eInline fuel filter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eReplace sooner if fuel is stale\/contaminated; check primer bulb and lines.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; 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:6px; border-bottom:1px solid #eee;\"\u003eWater pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eEvery 2–3 seasons or 200 hrs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eReplace sooner if telltale is weak or overheat alarm occurs.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-water-pump-repair-kits\"\u003eForce Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eAnodes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eInspect 50 hrs; replace at ~50% depletion\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eUse the correct material (fresh vs. salt\/brackish) to prevent corrosion.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; 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:6px; border-bottom:1px solid #eee;\"\u003eThermostat\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eInspect annually; replace 2–3 seasons or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eSticking thermostats cause cold running or overheat; verify spec temp.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eFuel\/oil system (2‑Stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eEach use (premix) \/ annually (oil injection check)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eMix at the manufacturer‑specified ratio or service oil pump\/lines; confirm for your model.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\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=\"max-width: 1100px; margin: 0 auto; padding: 8px 12px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service \u0026amp; Tune‑Up — \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\/force-water-pump-repair-kits\"\u003eForce 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\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 Seals \u0026amp; Service — \u003ca href=\"https:\/\/seasierra.com\/collections\/force-lower-unit-seal-kits\"\u003eForce 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 — \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width: 1100px; margin: 0 auto; padding: 8px 12px;\"\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 #ddd; padding:6px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:6px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:6px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eWeak telltale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eIntake screen clear? Impeller age? Thermostat sticking? Hose kinks?\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eWater pump kit, thermostat, intake screen\/grommets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eProp condition\/pitch; fuel quality; filter restriction; carb balance\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003ePropeller, fuel filter, carb gaskets\/needle seats, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eChoke\/enrichment operation; plug gap; primer bulb and fuel lines; air leaks\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eSpark plugs, fuel hoses, carburetor kit, primer bulb\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eExcessive smoke (2‑Stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003ePremix ratio correct? Oil pump setting\/lines intact? Idle mixture screws\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eSpark plugs, oil injection lines, carb gaskets\/adjusters\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eGearcase noise or metal in oil\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eOil level\/condition; prop shaft fishing line; seal condition\u003c\/td\u003e\n        \u003ctd style=\"padding:6px; border-bottom:1px solid #eee;\"\u003eLower unit seal kit, bearings, gear lube\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=\"max-width: 1100px; margin: 0 auto; padding: 8px 12px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable across different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome electrical, cooling, and gearcase components are shared across late ’80s–’90s Force models, but there are many variations. Always match by full model\/serial and verify the component’s compatibility for inline‑3 vs. inline‑4 platforms.\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\u003eAs a preventive measure every 2–3 seasons (about 200 hours), or immediately if the telltale weakens, you overheat, or you run the engine in sandy\/silty water. Consider a full kit when service history is unknown.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change the gear oil?\u003c\/summary\u003e\n    \u003cp\u003eAt least once per season or every 100 hours. If the oil appears milky, smells burnt, or contains metal, reseal and inspect the gearcase before further operation.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the full model and serial numbers, horsepower, shaft length, approximate year, and whether the engine is premix or oil‑injected. Photos of the nameplate and the part you’re replacing are also helpful.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"max-width: 1100px; margin: 0 auto; padding: 16px 12px;\"\u003e\n  \u003cp\u003eReady to find parts that fit your Force 2‑Stroke 70–150HP? Browse the main brand collection and narrow by horsepower, year, and model.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\" style=\"display:inline-block; padding:10px 16px; background:#0b63ce; color:#fff; text-decoration:none; border-radius:6px;\"\u003eShop Force Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; color:#333;\"\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-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\/force-2-stroke-70-150hp-outboard-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}