{"product_id":"koubliztic-carburetor-for-bolens-21-inch-140cc-lawn-mower-kit-fits-b-s-300e-550ex-primer-air-filter","title":"Koubliztic Carburetor for Bolens 21-inch 140cc Lawn Mower Kit — Fits B\u0026S 300E–550EX, Primer \u0026 Air Filter","description":"\u003cp\u003e\u003cstrong\u003eHigh-quality replacement carburetor kit for Bolens 21\" 140cc mowers that restores fuel flow and fit for models using B\u0026amp;S 300E–550EX series engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your Bolens, MTD or Murray 21\" mower with a 125–140cc Briggs \u0026amp; Stratton style engine is running rough, hard to start, or not idling properly, replacing the carburetor often fixes the issue. This complete Koubliztic kit includes the carburetor plus common consumables so you can reassemble and test without extra trips to the parts store. It’s engineered to align with the factory mounting points and fuel connections for models listed under part numbers such as 799583 and several OEM reference codes.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this carburetor improve mower starting and idling?\u003c\/h3\u003e\n\u003cp\u003eSwapping in a fresh carburetor removes clogged passages and worn jets that cause poor cold and hot starts. The calibrated fuel delivery and integrated primer bulb make choke and starting behavior more consistent, reducing stalls and rough idling.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit for specific 140cc B\u0026amp;S-style engines listed in the compatibility set\u003c\/li\u003e\n  \u003cli\u003eIncludes primer bulb and fuel shutoff for cleaner starts and safer storage\u003c\/li\u003e\n  \u003cli\u003eRebuilt fuel passages to restore steady idle and throttle response\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this fit my mower model and which part numbers does it replace?\u003c\/h3\u003e\n\u003cp\u003eThis cartridge was designed to replace carburetor assemblies used on Bolens 21\" mowers with 125–140cc engines and matches OEM references. It replaces several factory part numbers, so cross-checking your current part number or engine code ensures a hassle-free installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces 799583 and other common OEM numbers like 593261 and 595656\u003c\/li\u003e\n  \u003cli\u003eCompatible with codes such as 08P502-0034-F1 through 09P702-0128-F1 listed in the compatibility data\u003c\/li\u003e\n  \u003cli\u003eDesigned to match bolt pattern and fuel line locations for models 11A-B0BL765 and 11A-020W765\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the box and what tools will I need?\u003c\/h3\u003e\n\u003cp\u003eThe kit supplies the parts you typically replace when refreshing a carburetor installation, so you won’t need to source extra small components. Basic hand tools and a clean workspace are all that’s required to complete the swap in most cases.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes carburetor (799583), spark plug, two air filters, and air filter cover\u003c\/li\u003e\n  \u003cli\u003eAlso supplied: primer bulb, fuel filter, fuel shutoff valve, fuel hoses, clamps, and rings\u003c\/li\u003e\n  \u003cli\u003eSimple installation with screwdrivers, pliers, and a socket set; no specialized tools required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is this replacement part and what maintenance is recommended?\u003c\/h3\u003e\n\u003cp\u003eThe assembly is built from durable materials intended for routine mowing conditions; consumables like the air filter and fuel filter are included to prolong service life. Regular cleaning of the air filter and using fresh gasoline will help maintain performance and extend service intervals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRobust construction to stand up to regular lawn care use\u003c\/li\u003e\n  \u003cli\u003eReplace the air and fuel filters seasonally or sooner if used in dusty conditions\u003c\/li\u003e\n  \u003cli\u003eUse clean, stabilized fuel and follow manufacturer torque guidelines when installing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: This Koubliztic carburetor kit is ideal for homeowners, landscapers and DIY mechanics who own a Bolens, MTD or Murray 21\" lawn mower with a 125–140cc Briggs \u0026amp; Stratton-style engine and need a direct replacement. Choose this kit if you want a complete parts set—carburetor, filters, primer and fittings—to restore reliable starting and throttle response without sourcing multiple components separately.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this carburetor fit my Bolens 21\" model?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If your mower uses a 125–140cc B\u0026amp;amp;S-style engine and lists models 11A-B0BL765 or 11A-020W765, this carburetor is compatible. Check the OEM part number to confirm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are installation parts included in the kit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The package contains the carburetor, spark plug, air filters, air filter cover, primer bulb, fuel filter, shutoff valve, hoses, clamps and rings.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Koubliztic","offers":[{"title":"Default Title","offer_id":67591478476985,"sku":"B0FFLNL52C","price":64.57,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/koubliztic-carburetor-front-view_7b6a390e-d013-42bc-8ebf-a57cf24134df.jpg?v=1790552621","url":"https:\/\/redleafauto.ca\/products\/koubliztic-carburetor-for-bolens-21-inch-140cc-lawn-mower-kit-fits-b-s-300e-550ex-primer-air-filter","provider":"Redleaf Auto","version":"1.0","type":"link"}