{"product_id":"630740-o-ring-seal-for-main-jet-fuel-mixture-adjustment-screw-jlm-marine","title":"630740 O-Ring Seal for Main Jet Fuel Mixture Adjustment Screw | JLM Marine","description":"\u003ch2\u003e630740 O-Ring Seal for Main Jet Fuel Mixture Adjustment Screw | JLM Marine\u003c\/h2\u003e\n\n\u003cp\u003eThis high-quality O-ring seal is designed for the main jet fuel mixture adjustment screw in Tecumseh carburetors. It ensures a proper seal to prevent fuel leaks and maintain optimal engine performance. Compatible with a wide range of Tecumseh carburetor models including CA-630795A, CA-630812A, CA-630872A, CA-630888, CA-630892, CA-630893, CA-630894, CA-630895, CA-630911, CA-630912, CA-630920, CA-630950, CA-630950A, CA-630958B, CA-630961, CA-630961A, CA-630962, CA-630962A, CA-630964B, CA-630969, and other models. Also suitable for most S-200, S-620, Snowmaster, and Snowmaster20 snowblowers.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket replacement directly replaces \u003cstrong\u003eTecumseh 630740\u003c\/strong\u003e, \u003cstrong\u003eRotary 146\u003c\/strong\u003e, and \u003cstrong\u003eSierra 7-02166-2\u003c\/strong\u003e, providing reliable performance at an excellent value.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003ePrecision-engineered seal for carburetor fuel mixture adjustment screws\u003c\/li\u003e\n\u003cli\u003ePackage includes 15 O-ring seals for multiple repairs or maintenance\u003c\/li\u003e\n\u003cli\u003eEasy installation for quick carburetor servicing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"5\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTecumseh\u003c\/td\u003e\n\u003ctd\u003e630740\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRotary\u003c\/td\u003e\n\u003ctd\u003e146\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e7-02166-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFits the Following Tecumseh Carburetors:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eCA-630795A, CA-630812A, CA-630872A, CA-630888, CA-630892, CA-630893, CA-630894, CA-630895, CA-630911, CA-630912, CA-630920, CA-630950, CA-630950A, CA-630958B, CA-630961, CA-630961A, CA-630962, CA-630962A, CA-630964B, CA-630969, and other models.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAlso Compatible With:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eMost S-200, S-620, Snowmaster, and Snowmaster20 snowblowers.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"5\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eBrand New\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMain Jet Fuel Mixture Adjustment Screw Seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brand\u003c\/td\u003e\n\u003ctd\u003eTecumseh Carburetors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh-Quality Rubber O-Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eYour package includes:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e15 × O-Ring Seals for Main Jet Fuel Mixture Adjustment Screw (Tecumseh 630740)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eEnsure the engine is off and cool before beginning any carburetor work.\u003c\/li\u003e\n\u003cli\u003eRemove the carburetor from the engine following your equipment's service manual.\u003c\/li\u003e\n\u003cli\u003eLocate the main jet fuel mixture adjustment screw on the carburetor body.\u003c\/li\u003e\n\u003cli\u003eCarefully unscrew and remove the fuel mixture adjustment screw. Note the number of turns for reassembly.\u003c\/li\u003e\n\u003cli\u003eRemove the old O-ring seal from the adjustment screw groove.\u003c\/li\u003e\n\u003cli\u003eClean the screw and groove area thoroughly to remove any debris or old seal residue.\u003c\/li\u003e\n\u003cli\u003eInstall the new O-ring seal onto the adjustment screw, ensuring it sits properly in the groove.\u003c\/li\u003e\n\u003cli\u003eApply a small amount of clean fuel or oil to the O-ring to aid installation.\u003c\/li\u003e\n\u003cli\u003eReinstall the adjustment screw, turning it in gently until it seats, then back it out the same number of turns noted earlier.\u003c\/li\u003e\n\u003cli\u003eReinstall the carburetor onto the engine and reconnect all fuel lines and linkages.\u003c\/li\u003e\n\u003cli\u003eStart the engine and check for fuel leaks around the adjustment screw area.\u003c\/li\u003e\n\u003cli\u003eAdjust the fuel mixture as needed per your equipment's specifications for optimal performance.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if this O-ring fits my Tecumseh carburetor?\u003c\/strong\u003e\u003cbr\u003e\nA: Check your carburetor model number against the compatible list provided above (CA-630795A, CA-630812A, CA-630872A, etc.). This O-ring replaces Tecumseh 630740, Rotary 146, and Sierra 7-02166-2, so if your parts manual references any of these numbers, this seal will fit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why is fuel leaking from my carburetor adjustment screw?\u003c\/strong\u003e\u003cbr\u003e\nA: A worn or damaged O-ring seal is the most common cause of fuel leaks around the mixture adjustment screw. Replacing the O-ring with this part should resolve the issue. Ensure the screw is not overtightened, as this can damage the new seal.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace this O-ring seal?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace the O-ring whenever you perform carburetor maintenance or rebuild, or immediately if you notice fuel leaking from the adjustment screw area. Regular replacement during seasonal servicing helps prevent fuel system issues.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old O-ring if it looks okay?\u003c\/strong\u003e\u003cbr\u003e\nA: It's not recommended. O-rings can develop micro-cracks and lose elasticity over time, even if they appear intact. Always use a new O-ring during carburetor service to ensure a proper seal and prevent future leaks.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or 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\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\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\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\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\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\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\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\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":51981004144953,"sku":"23OR469x15","price":12.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_f7d0a440-2615-495d-b70c-b7b57829905e.png?v=1772414337","url":"https:\/\/jlmmarine.com\/products\/630740-o-ring-seal-for-main-jet-fuel-mixture-adjustment-screw-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}