{"product_id":"carburetor-repair-kit-for-mercruiser-carburetors-r-6647a-r-6647aaa-sierra-18-7728","title":"Sierra Carburetor Kit 18-7728 for Mercruiser H4\/4150 R6647A Carburetors","description":"\u003cp\u003eThe Sierra 18-7728 is a carburetor kit built to rebuild and restore Mercruiser carburetors coded H4\/4150 and R6647A, matched to serial number range 6083145-B816540. Over time, carburetor gaskets, needles, and seals wear out or degrade from ethanol-blended fuel exposure, leading to rough idle, flooding, or poor fuel metering. This kit supplies the internal wear components needed to bring the carburetor back to proper operating condition without replacing the entire unit, which is a more economical and time-efficient repair path for boat owners and marine technicians. Note that this kit does not include metering rods, so those should be inspected separately and sourced individually if worn. Installation follows standard carburetor rebuild procedure: the carburetor is removed from the intake, disassembled, cleaned, and the kit components are installed in place of the worn originals before reassembly and reinstallation. The kit is packaged for a single carburetor rebuild and is intended for use by anyone comfortable performing a carburetor overhaul, from DIY boat owners to marine service shops. Always match the kit to the correct carburetor code and serial number range before ordering to ensure proper fit.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-7728\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Carburetor Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercruiser, Carb Code H4\/4150, R6647A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Number Range:\u003c\/strong\u003e 6083145-B816540\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes Metering Rods:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 747730045382\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.46 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser carburetors, Carb Code H4\/4150, R6647A, Serial Number 6083145-B816540\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eNo OEM cross-reference numbers are listed for this kit.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat carburetor does the Sierra 18-7728 kit fit?\u003c\/strong\u003e The Sierra 18-7728 carburetor kit fits Mercruiser carburetors with Carb Code H4\/4150 or R6647A, within the serial number range 6083145-B816540.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7728 kit include metering rods?\u003c\/strong\u003e No, the Sierra 18-7728 carburetor kit does not include metering rods; those must be sourced separately if replacement is needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7728 carburetor kit weigh?\u003c\/strong\u003e The Sierra 18-7728 carburetor kit weighs 0.46 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7728 kit enough to fully rebuild a carburetor?\u003c\/strong\u003e It supplies the wear components needed for a standard rebuild of a matching H4\/4150 or R6647A Mercruiser carburetor, aside from the metering rods, which are not included in the 18-7728 kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm my carburetor matches this kit before ordering?\u003c\/strong\u003e Check your carburetor's stamped code against H4\/4150 or R6647A and confirm the engine serial number falls within 6083145-B816540, the application range for the Sierra 18-7728 kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-7728 kit myself?\u003c\/strong\u003e Yes, the Sierra 18-7728 kit is installed using standard carburetor rebuild steps: remove and disassemble the carburetor, clean it, install the kit components, then reassemble and reinstall.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-7728 carburetor kit?\u003c\/strong\u003e The UPC for the Sierra 18-7728 carburetor kit is 747730045382.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7728 an OEM part or an aftermarket kit?\u003c\/strong\u003e The Sierra 18-7728 is a Sierra-branded carburetor kit designed as a rebuild kit for the specified Mercruiser carburetor codes, not an OEM Mercruiser-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-7728 carburetor kit box?\u003c\/strong\u003e The box contains the internal rebuild components for the specified Mercruiser H4\/4150 and R6647A carburetors, excluding metering rods.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-7728 kit work on any Mercruiser carburetor?\u003c\/strong\u003e No, the Sierra 18-7728 kit is matched specifically to Carb Code H4\/4150 or R6647A carburetors within serial number range 6083145-B816540, not all Mercruiser carburetors.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988386525403,"sku":"SIE-18-7728","price":122.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-7728_lg__01236.1722361960.500.750.jpg?v=1785329154","url":"https:\/\/www.goodvibesmarina.com\/products\/carburetor-repair-kit-for-mercruiser-carburetors-r-6647a-r-6647aaa-sierra-18-7728","provider":"Good Vibes Marina","version":"1.0","type":"link"}