{"product_id":"merc-766","title":"Mercury Quicksilver Carburetor Diaphragm Kit 857005A1","description":"\u003ch2\u003eMercury Quicksilver Carburetor Diaphragm Kit — 857005A1\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e857005A1  |  Mercury Catalog: 21-857005A1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMercury Marine \/ Quicksilver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOfficial Product Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCarburetor Diaphragm Repair Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKit Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12-piece set — fuel-pump diaphragms, gaskets, check valves, spring, cap, and screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSystem\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFuel \/ Carburetor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Family\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMercury \u0026amp; Mariner 2-stroke outboards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGTIN \/ Barcode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e745061440685\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cp\u003eMercury officially rates 857005A1 for \u003cstrong\u003eselected 30–65 HP Mercury and Mariner 2-stroke outboards\u003c\/strong\u003e. Exact fitment depends on carburetor and fuel-pump configuration. Confirm by engine horsepower, model year, serial number, and parts diagram before ordering.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e30 HP Mercury \u0026amp; Mariner 2-stroke outboards (selected models)\u003c\/li\u003e\n\u003cli\u003e40 HP Mercury \u0026amp; Mariner 2-stroke outboards (selected models)\u003c\/li\u003e\n\u003cli\u003e50 HP Mercury \u0026amp; Mariner 2-stroke outboards (selected models)\u003c\/li\u003e\n\u003cli\u003e60 HP Mercury \u0026amp; Mariner 2-stroke outboards (selected models)\u003c\/li\u003e\n\u003cli\u003e65 HP Mercury \u0026amp; Mariner 2-stroke outboards (selected models)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSerial Number \u0026amp; Diagram Fitment\u003c\/h2\u003e\n\u003cp\u003eMercury used multiple diaphragm-kit configurations across similar 2-stroke outboards. Always verify by \u003cstrong\u003eengine model, serial number, and the carburetor\/fuel-pump parts diagram\u003c\/strong\u003e — not by appearance alone. If you have your serial number, contact us and we will confirm fitment before you order.\u003c\/p\u003e\n\n\u003ch2\u003eSuperseded \/ Legacy Part Numbers\u003c\/h2\u003e\n\u003cp\u003e857005A1 is the current replacement for the following earlier kit numbers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e42990A8\u003c\/li\u003e\n\u003cli\u003e42990A10\u003c\/li\u003e\n\u003cli\u003e42990A11\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAdditional 42990A-series numbers may also cross to 857005A1 depending on application.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace the Diaphragm Assembly\u003c\/h2\u003e\n\u003cp\u003eConsider a full rebuild when you notice any of the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHard starting or failure to start\u003c\/li\u003e\n\u003cli\u003eFuel starvation at speed\u003c\/li\u003e\n\u003cli\u003eHesitation or stumble during acceleration\u003c\/li\u003e\n\u003cli\u003ePoor high-speed fuel delivery\u003c\/li\u003e\n\u003cli\u003eIrregular idle\u003c\/li\u003e\n\u003cli\u003eLoss of power under load\u003c\/li\u003e\n\u003cli\u003eFuel leakage at the diaphragm section\u003c\/li\u003e\n\u003cli\u003eHardened, torn, or distorted diaphragm material\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eClean the carburetor body thoroughly before disassembly\u003c\/li\u003e\n\u003cli\u003eNote the order and orientation of diaphragms, gaskets, and check valves\u003c\/li\u003e\n\u003cli\u003eReplace the entire soft-parts set — do not reuse hardened or compressed components\u003c\/li\u003e\n\u003cli\u003eInspect mating surfaces for corrosion or distortion before reassembly\u003c\/li\u003e\n\u003cli\u003eInspect fuel hoses and connections while the assembly is apart\u003c\/li\u003e\n\u003cli\u003eFollow the Mercury service manual for your specific engine serial range\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Parts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167577571364\"\u003eMercury Carburetor Fuel Pump Diaphragm 16275\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167577636900\"\u003eMercury MerCruiser Quicksilver Carburetor Fuel Pump Diaphragm 16325\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167577473060\"\u003eMercury Carburetor Fuel Pump Cover Gasket 27-16274\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131409870884\"\u003eMercury MerCruiser Quicksilver Diaphragm Kit 55278A1\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThis is the kit to reach for when a 30–65 HP 2-stroke Mercury or Mariner is showing fuel-delivery symptoms — hard starting, hesitation, or lean-running conditions are the most common complaints we see linked to a worn diaphragm on these engines. Because Mercury supplies the complete 12-piece soft-parts set together, a full rebuild is more reliable than sourcing individual components separately. Match by the engine parts diagram first, then confirm with the serial number — the same horsepower range can carry different carburetor assemblies across production years.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563885363236,"sku":"857005A1","price":49.52,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/c6fd72cf-caf1-4d52-bf08-79df94db4727.png?v=1789169840","url":"https:\/\/marisolmarine.com\/products\/merc-766","provider":"Marisol Marine Company","version":"1.0","type":"link"}