{"title":"Honda BF4 Parts \u0026 Diagrams","description":"\u003cp\u003eOEM and aftermarket replacement parts for Honda BF4. Scroll down for exploded parts diagrams (25), specifications, and maintenance reference.\u003c\/p\u003e","products":[{"product_id":"thermostat-kit-for-honda-outboard-motor-4-stroke-bf5-to-bf100-50-52c-19300-881-761-19300-881-761-19351-zv4-610","title":"Thermostat Kit – Fits Honda Outboard 4-Stroke BF5 to BF100 (Replaces 19300-881-761)","description":"\u003ch2\u003eThermostat Kit – Fits Honda Outboard 4-Stroke BF5 to BF100 (Replaces 19300-881-761)\u003c\/h2\u003e\n\u003cp\u003eThis thermostat kit is engineered for a wide range of Honda 4-stroke marine outboard engines from 5 to 100 HP, covering models from 1997 to 2007 and newer. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.\u003c\/p\u003e\n\u003cp\u003eThis kit serves as a direct replacement for Honda part number \u003cstrong\u003e19300-881-761\u003c\/strong\u003e, Sierra \u003cstrong\u003e18-3627\u003c\/strong\u003e, and OVERSEE \u003cstrong\u003e19300-881-761\u003c\/strong\u003e, providing a reliable aftermarket solution.\u003c\/p\u003e\n\u003cul\u003e\n \t\u003cli\u003eEngineered to maintain a consistent operating temperature of \u003cstrong\u003e50–52°C (122–125.6°F)\u003c\/strong\u003e.\u003c\/li\u003e\n \t\u003cli\u003eDesigned for \u003cstrong\u003edirect replacement\u003c\/strong\u003e, ensuring a straightforward installation process.\u003c\/li\u003e\n \t\u003cli\u003eComplete kit includes a thermostat, gasket, and two rubber seal rings for a comprehensive service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\u003e\n \t\u003cthead\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003cth\u003eBrand\u003c\/th\u003e\n \t\t\t\u003cth\u003ePart Number\u003c\/th\u003e\n \t\t\u003c\/tr\u003e\n \t\u003c\/thead\u003e\n \t\u003ctbody\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eSierra\u003c\/td\u003e\n \t\t\t\u003ctd\u003e18-3627\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eOVERSEE\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\u003e\n \t\u003cthead\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003cth\u003eBrand\u003c\/th\u003e\n \t\t\t\u003cth\u003eModel\u003c\/th\u003e\n \t\t\t\u003cth\u003eRated HP\u003c\/th\u003e\n \t\t\t\u003cth\u003eStroke\u003c\/th\u003e\n \t\t\t\u003cth\u003eYears\u003c\/th\u003e\n \t\t\t\u003cth\u003eOEM Part No.\u003c\/th\u003e\n \t\t\t\u003cth\u003eNotes\u003c\/th\u003e\n \t\t\u003c\/tr\u003e\n \t\u003c\/thead\u003e\n \t\u003ctbody\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF50F-LA, BF50F-SA\u003c\/td\u003e\n \t\t\t\u003ctd\u003e50\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003eCylinder head application\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF5A Series (LA\/SA variants)\u003c\/td\u003e\n \t\t\t\u003ctd\u003e5\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003eIncludes BF5A1, BF5A2, BF5A4, BF5A5, BF5A6\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF5AK0, BF5AK2, BF5AK3 (LA\/SA)\u003c\/td\u003e\n \t\t\t\u003ctd\u003e5\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003e\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF5AH, BF5AX, BF5AM, BF5AY\u003c\/td\u003e\n \t\t\t\u003ctd\u003e5\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997-2000\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003ePre-2001 models\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF5AW (SA)\u003c\/td\u003e\n \t\t\t\u003ctd\u003e5\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1998\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1998 model year only\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF6B, BF6BX\u003c\/td\u003e\n \t\t\t\u003ctd\u003e6\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003e\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF6AH (LHNA\/SHNA)\u003c\/td\u003e\n \t\t\t\u003ctd\u003e6\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003e\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF75F\u003c\/td\u003e\n \t\t\t\u003ctd\u003e7.5\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003e\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF8 Series\u003c\/td\u003e\n \t\t\t\u003ctd\u003e8\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003eIncludes BF8AH, BF8AK, BF8AM, BF8AX, BF8BX, BF8B\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF9.9 Series\u003c\/td\u003e\n \t\t\t\u003ctd\u003e9.9\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003eIncludes BF9.9AH, BF9.9AK, BF9.9AM, BF9.9B, BF9.9AX, BF9.9BX\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF100F\u003c\/td\u003e\n \t\t\t\u003ctd\u003e10\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003e\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF15 Series\u003c\/td\u003e\n \t\t\t\u003ctd\u003e15\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e1997–2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003eIncludes BF15A1, BF15A2, BF15AH, BF15AK, BF15AM, BF15AX, BF15B, BF15B2, BF15BX\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHonda\u003c\/td\u003e\n \t\t\t\u003ctd\u003eBF5DH (LHNA\/SHNA)\u003c\/td\u003e\n \t\t\t\u003ctd\u003e5\u003c\/td\u003e\n \t\t\t\u003ctd\u003e4-Stroke\u003c\/td\u003e\n \t\t\t\u003ctd\u003e2007+\u003c\/td\u003e\n \t\t\t\u003ctd\u003e19300-881-761\u003c\/td\u003e\n \t\t\t\u003ctd\u003e\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n \t\u003cthead\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003cth\u003eSpecification\u003c\/th\u003e\n \t\t\t\u003cth\u003eValue\u003c\/th\u003e\n \t\t\u003c\/tr\u003e\n \t\u003c\/thead\u003e\n \t\u003ctbody\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eProduct Type\u003c\/td\u003e\n \t\t\t\u003ctd\u003eMarine Outboard Engine Thermostat Kit\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eInstallation\u003c\/td\u003e\n \t\t\t\u003ctd\u003eDirect replacement\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n \t\t\t\u003ctd\u003e\u003cstrong\u003e50–52°C (122–125.6°F)\u003c\/strong\u003e\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eHousing Material\u003c\/td\u003e\n \t\t\t\u003ctd\u003eHigh-grade corrosion-resistant alloy\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eConnection\u003c\/td\u003e\n \t\t\t\u003ctd\u003eDirect fit to cylinder head\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\t\u003ctr\u003e\n \t\t\t\u003ctd\u003eWarranty\u003c\/td\u003e\n \t\t\t\u003ctd\u003eVaries by manufacturer (typically 1 year)\u003c\/td\u003e\n \t\t\u003c\/tr\u003e\n \t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n \t\u003cli\u003e1 x Thermostat (\u003cspan style=\"color:red;\"\u003e19300-881-761\u003c\/span\u003e)\u003c\/li\u003e\n \t\u003cli\u003e2 x Rubber Seal Rings (\u003cspan style=\"color:red;\"\u003e19302-921-003\u003c\/span\u003e)\u003c\/li\u003e\n \t\u003cli\u003e1 x Thermostat Gasket (\u003cspan style=\"color:red;\"\u003e19351-ZV4-610\u003c\/span\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eSafety First:\u003c\/strong\u003e Disconnect the battery and ensure the engine is cool.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eDrain Coolant:\u003c\/strong\u003e Drain the engine's cooling system partially to a level below the thermostat housing.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eLocate Housing:\u003c\/strong\u003e Find the thermostat housing, typically located on the cylinder head.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eRemove Bolts:\u003c\/strong\u003e Carefully unbolt and remove the thermostat housing cover.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eExtract Old Parts:\u003c\/strong\u003e Remove the old thermostat, gasket, and any seals. Note their orientation.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eClean Surfaces:\u003c\/strong\u003e Thoroughly clean the mating surfaces of the housing and cylinder head to ensure a proper seal.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eInstall New Parts:\u003c\/strong\u003e Place the new thermostat, gasket, and seals into the housing in the correct order and orientation.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eReassemble:\u003c\/strong\u003e Re-install the housing cover and tighten the bolts to the manufacturer's recommended torque specifications.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eRefill and Check:\u003c\/strong\u003e Refill the cooling system. Reconnect the battery, start the engine, and carefully check for any leaks around the housing as the engine warms up.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this thermostat kit will fit my specific Honda engine?\u003c\/strong\u003e\u003cbr\u003e\nA: The best way is to check the \u003cstrong\u003eCompatible Engine Models\u003c\/strong\u003e table on this page. Cross-reference your engine's model, horsepower, and year. You can also verify by matching your existing part number with those listed in the \u003cstrong\u003ePart Number Cross-Reference\u003c\/strong\u003e table.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the common signs of a failing outboard thermostat?\u003c\/strong\u003e\u003cbr\u003e\nA: Symptoms include engine overheating, especially at idle or low speeds, or the engine taking an unusually long time to reach its normal operating temperature. You might also notice erratic readings on the temperature gauge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the 50-52°C operating temperature important?\u003c\/strong\u003e\u003cbr\u003e\nA: This specific temperature range is vital for Honda outboards to ensure efficient combustion, prevent carbon buildup, and reduce engine wear. Using a thermostat with the wrong temperature rating can lead to poor performance and long-term engine damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n \t\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n \t\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n \t\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n \t\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50579319488825,"sku":"23TH614","price":19.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Thermostat_Kit_for_Honda_Outboard_Motor_4_Stroke_BF5_to_BF100_50-52C_19300-881-761_______19300-881-761_19351-ZV4-610_-_JLM_MARINE-8291327.jpg?v=1755251565"}],"url":"https:\/\/jlmmarine.com\/collections\/honda-bf4.oembed","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}