{"product_id":"merc-625","title":"Mercury MerCruiser Carburetor Idle Mixture Screw Kit 811539","description":"\u003cp\u003eMercury MerCruiser 811539 is a genuine OEM \u003cstrong\u003eidle mixture screw kit\u003c\/strong\u003e, and current Mercury dealer references show it superseded to \u003cstrong\u003e8M0154265\u003c\/strong\u003e. Current listings describe the part as \u003cstrong\u003eSCREW KIT, Idle Mixture\u003c\/strong\u003e or \u003cstrong\u003eSCREW-IDLE\/SPRING\u003c\/strong\u003e, which is a more accurate SKU-based description than a generic “screw” listing.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine OEM part number \u003cstrong\u003e811539\u003c\/strong\u003e, replaced by \u003cstrong\u003e8M0154265\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCurrent part description is \u003cstrong\u003eidle mixture screw kit \/ screw-idle-spring\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCurrent dealer listing shows \u003cstrong\u003eGTIN 745061303461\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCurrent shipping specs are approximately \u003cstrong\u003e0.02 lb\u003c\/strong\u003e, \u003cstrong\u003e2.00 in. x 1.00 in. x 0.50 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe strongest supportable fitment for 811539 \/ 8M0154265 is \u003cstrong\u003ecarbureted MerCruiser GM-based gasoline engines\u003c\/strong\u003e. Current Mercury where-used references connect it to a broad range of carbureted applications including \u003cstrong\u003e4.3L Gen II \/ Gen+ V6\u003c\/strong\u003e, \u003cstrong\u003e5.0L\u003c\/strong\u003e, \u003cstrong\u003e5.0LX\u003c\/strong\u003e, \u003cstrong\u003e5.7L\u003c\/strong\u003e, \u003cstrong\u003e5.7LX\u003c\/strong\u003e, \u003cstrong\u003e350 MAG Alpha\u003c\/strong\u003e, \u003cstrong\u003e454 MAG Bravo\u003c\/strong\u003e, \u003cstrong\u003e502 MAG Bravo\u003c\/strong\u003e, \u003cstrong\u003e7.4L Bravo \/ MIE\u003c\/strong\u003e, \u003cstrong\u003e8.2L MIE\u003c\/strong\u003e, and several \u003cstrong\u003eski, inboard, Alpha, Bravo, and crate-engine\u003c\/strong\u003e packages.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eVerify fitment by exact \u003cstrong\u003eengine serial number\u003c\/strong\u003e and the correct \u003cstrong\u003ecarburetor parts diagram\u003c\/strong\u003e before ordering. This idle mixture screw kit appears across many carbureted MerCruiser packages, so serial-based confirmation is the safest way to match the correct carburetor service part.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace this part when the idle mixture screw is damaged, missing, bent, seized, or when carburetor service shows the original idle screw and spring are no longer usable. Because this part is tied directly to the \u003cstrong\u003eidle mixture circuit\u003c\/strong\u003e, problems here can affect idle quality and adjustment. That service guidance is a practical inference supported by current parts descriptions and carburetor idle-mixture references.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eInstall 811539 \/ 8M0154265 only after confirming the correct MerCruiser carburetor application. Since this is an \u003cstrong\u003eidle mixture screw\u003c\/strong\u003e part, it should be matched to the exact carburetor setup and adjusted carefully during carburetor service rather than swapped in by appearance alone.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCurrent sources show \u003cstrong\u003e8M0154265\u003c\/strong\u003e as the active replacement for \u003cstrong\u003e811539\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFor carburetor parts like this, the important match is the \u003cstrong\u003eexact carburetor family\u003c\/strong\u003e, not just the engine size. A quick serial-number and carburetor lookup usually avoids ordering the wrong idle mixture hardware for a similar MerCruiser setup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563880022052,"sku":"811539","price":13.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/8f89c55f-bfc9-4b82-8946-dc40eca2509d.png?v=1777054243","url":"https:\/\/marisolmarine.com\/products\/merc-625","provider":"Marisol Marine Company","version":"1.0","type":"link"}