{"product_id":"thermostat-fits-honda-bf-75-225-hp-outboard-motors-replaces-19300-zy3-023-19300-zy6-003","title":"Thermostat – Fits Honda BF 75-225 HP Outboard Motors (Replaces 19300-ZY3-023, 19300-ZY6-003)","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;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003eThermostat – Fits Honda BF 75-225 HP Outboard Motors\u003c\/strong\u003e is a crucial component designed for Honda Marine 4-Stroke outboard motors, including models from 75 HP to 225 HP manufactured between 2002 and the present. It ensures your engine maintains the correct operating temperature, which is vital for optimal performance, fuel efficiency, and overall longevity.\u003c\/p\u003e\n  \u003cp\u003eThis part is a direct, multi-fit replacement for Honda OEM part numbers 19300-ZY3-023 and 19300-ZY6-003.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eInstalls directly in place of the factory original thermostat.\u003c\/li\u003e\n    \u003cli\u003eMaintains a consistent engine operating temperature of 50°C (122°F).\u003c\/li\u003e\n    \u003cli\u003eIncludes two new thermostat seals for a complete installation.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket suppliers.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003ePart Number\u003c\/th\u003e\n          \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eHonda\u003c\/td\u003e\n          \u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n          \u003ctd\u003eOEM Reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eHonda\u003c\/td\u003e\n          \u003ctd\u003e19300-ZY6-003\u003c\/td\u003e\n          \u003ctd\u003eOEM Reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n         \u003ctr\u003e\n          \u003ctd\u003eHonda\u003c\/td\u003e\n          \u003ctd\u003e19300ZY3023\u003c\/td\u003e\n          \u003ctd\u003eOEM Reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eHonda\u003c\/td\u003e\n          \u003ctd\u003e19300ZY6003\u003c\/td\u003e\n          \u003ctd\u003eOEM Reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eConfirm your engine model and year in the table below to ensure accurate fitment.\u003c\/p\u003e\n  \u003cp\u003eFor Honda Marine owners, this thermostat fits a wide range of BF and BFT series 4-stroke engines produced from 2002 onward.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eModel\u003c\/th\u003e\n          \u003cth\u003eRated HP\u003c\/th\u003e\n          \u003cth\u003eStroke\u003c\/th\u003e\n          \u003cth\u003eYears\u003c\/th\u003e\n          \u003cth\u003eOEM Part No.\u003c\/th\u003e\n          \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF75DK0, DK2, DK3, DK4\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY6-003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF80A, AK1\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY6-003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBFT80AK1\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY6-003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF90DK0, DK2, DK4, DK5\u003c\/td\u003e\n\u003ctd\u003e90\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY6-003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF100A, AK1\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY6-003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBFT100AK1\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY6-003\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF115A2, A3, D, DK1\u003c\/td\u003e\n\u003ctd\u003e115\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF130A2, A3\u003c\/td\u003e\n\u003ctd\u003e130\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF135A4, AK2\u003c\/td\u003e\n\u003ctd\u003e135\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF150A4, AK2\u003c\/td\u003e\n\u003ctd\u003e150\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF175A3, A6, AK1, AK2, AK3\u003c\/td\u003e\n\u003ctd\u003e175\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF200A2, A3, A6, AK1, AK2, AK3\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eBF225A2, A3, A6, AK1, AK2, K3\u003c\/td\u003e\n\u003ctd\u003e225\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2002–2012\u003c\/td\u003e\n\u003ctd\u003e19300-ZY3-023\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat Assy\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n    \u003cdt\u003eOperating Temperature\u003c\/dt\u003e\n\u003cdd\u003e50°C (122°F)\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eStainless Steel, Copper\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Thermostat (19300-ZY3-023\/19300-ZY6-003)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Thermostat Seals\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eEnsure the engine is completely cool before starting.\u003c\/li\u003e\n    \u003cli\u003eLocate the thermostat housing on the engine block, referring to your service manual if needed.\u003c\/li\u003e\n    \u003cli\u003ePlace a drain pan under the housing and slowly loosen the bolts to drain the coolant.\u003c\/li\u003e\n    \u003cli\u003eRemove the old thermostat and gasket or seal. Clean any residue from the housing and cover surfaces.\u003c\/li\u003e\n    \u003cli\u003eInstall the new thermostat and seal, ensuring they are oriented correctly.\u003c\/li\u003e\n    \u003cli\u003eTighten the housing bolts to the manufacturer-specified torque. Do not overtighten.\u003c\/li\u003e\n    \u003cli\u003eRefill the cooling system with the recommended coolant type.\u003c\/li\u003e\n    \u003cli\u003eStart the engine and check for leaks around the housing as it warms up. Top off coolant if necessary.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if my thermostat is failing?\u003c\/summary\u003e\n    \u003cp\u003eCommon signs include engine overheating alarms, the engine running too cold (not reaching operating temperature), or visible coolant leaks around the thermostat housing. Poor engine performance or increased fuel consumption can also indicate a problem.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this thermostat compatible with both 19300-ZY3-023 and 19300-ZY6-003?\u003c\/summary\u003e\n    \u003cp\u003eYes, this thermostat is designed to be a direct interchange for both Honda part numbers. It fits the same range of engine models and operates at the same temperature specification.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I replace my outboard's thermostat?\u003c\/summary\u003e\n    \u003cp\u003eAs a preventative maintenance item, many service manuals recommend replacing the thermostat and water pump impeller every 2-3 years, or more frequently if used in saltwater. Always consult your owner's manual for specific intervals.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat happens if the thermostat is stuck open or closed?\u003c\/summary\u003e\n    \u003cp\u003eA thermostat stuck open will cause the engine to run too cool, leading to inefficient combustion, carbon buildup, and poor performance. A thermostat stuck closed is more dangerous; it will prevent coolant from circulating, causing the engine to overheat quickly and risking severe damage.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM part or an aftermarket replacement?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9001 certified facility and are batch-inspected for quality and consistency.\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\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations, with expedited options available at checkout where applicable.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n    \u003cp\u003eThis part is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not install the part.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement component, not an Original Equipment Manufacturer (OEM) part.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is highly recommended for safety and optimal performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for demanding real-world conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Enjoy free standard delivery to most regions worldwide, with typical transit times of 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with our manufacturing partners, we offer fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718243193147,"sku":"QM-19300-ZY6-003","price":21.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/QM-19300-ZY6-003.png?v=1762958096","url":"https:\/\/seasierra.com\/products\/thermostat-fits-honda-bf-75-225-hp-outboard-motors-replaces-19300-zy3-023-19300-zy6-003","provider":"SeaSierra","version":"1.0","type":"link"}