{"product_id":"lifetime-warranty-491590-carburetor-for-bs-491590-390811-392152-carb-fits-191700-192700-193700-engine-series-vertical-engine-with-gasket-air-filter-fuel-filter-spark-plug-kit","title":"491590 Carburetor - Fits B\u0026S 491590 390811 392152 Carb 191700 192700 193700 Engine Series Vertical Engine","description":"\u003ch2\u003e491590 Carburetor Tune-Up Kit\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized for 190000 Series:\u003c\/strong\u003e Precision-jetted for 191700, 192700, and 193700 series vertical shaft engines, providing the correct fuel-to-air ratio for high-torque lawn and garden applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-In-One Restoration:\u003c\/strong\u003e A comprehensive kit featuring a pre-calibrated carburetor, high-micron fuel filter, premium spark plug, and a high-flow air filter for a total engine refresh.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-Cast Alloy Body:\u003c\/strong\u003e Manufactured from a high-density alloy to resist thermal expansion and warping, ensuring a consistent vacuum seal and stable idle speeds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual Choke Integration:\u003c\/strong\u003e Designed for easy interface with factory choke and throttle linkages, allowing for smooth operation and reliable cold-weather starting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSediment-Resistant Design:\u003c\/strong\u003e Features an improved fuel bowl and needle valve assembly designed to resist the \"gumming\" effects of ethanol-blended fuels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBriggs \u0026amp; Stratton:\u003c\/strong\u003e 491590, 390811, 392152\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOthers:\u003c\/strong\u003e 491577, 391429, 390323\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis carburetor kit is a direct replacement for vintage and modern Briggs \u0026amp; Stratton vertical engines typically found on riding mowers and large walk-behinds. Key fitment includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Series:\u003c\/strong\u003e 191700, 191701, 191702, 191707, 192701, 192702, 192707, 193701, 193702, 193707.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment Types:\u003c\/strong\u003e Fits riding lawn tractors and heavy-duty walk-behind mowers from John Deere, Craftsman, Toro, and Murray utilizing the 190000 series engine platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Verify your original carburetor shape, as some \"L-Head\" engines in this series use a different intake manifold configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine \"Hunts\" or Surges:\u003c\/strong\u003e The engine RPM fluctuates wildly at a steady throttle position, indicating a clogged pilot jet or a vacuum leak at the gasket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarting Only on Fluid:\u003c\/strong\u003e The engine will only fire if starting fluid is sprayed into the intake, confirming the carburetor is not drawing fuel from the bowl.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Smoke \/ Fouled Plug:\u003c\/strong\u003e The engine runs \"rich\" and emits black smoke, suggesting the internal float is stuck or the main jet is restricted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Leaks:\u003c\/strong\u003e Gasoline drips from the air filter housing or the bottom of the carburetor while the engine is off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfiring:\u003c\/strong\u003e The engine pops or backfires through the intake when under load, often caused by a lean fuel mixture.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinkage Geometry:\u003c\/strong\u003e Use your phone to take a clear photo of the governor spring and throttle linkage setup before disassembly. These small springs are critical for correct engine speed control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket Surface Prep:\u003c\/strong\u003e Carefully scrape all old gasket material from the engine intake port. Even a tiny piece of leftover paper can cause an air leak that leads to surging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlush the Tank:\u003c\/strong\u003e If the old carburetor was clogged with \"green\" varnish, you must drain the gas tank and replace the fuel line with the included filter to prevent immediate contamination of the new unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark Plug Gap:\u003c\/strong\u003e Always check the gap on the included spark plug before installation (typically 0.030\") to ensure optimal combustion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvoid Over-tightening:\u003c\/strong\u003e The carburetor body is made of soft alloy. Tighten the mounting bolts evenly but avoid excessive force to prevent cracking the intake flange.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":46495303467197,"sku":"AZ00206236","price":30.42,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00206236_1.jpg?v=1773213057","url":"https:\/\/bluestarsparts.com\/products\/lifetime-warranty-491590-carburetor-for-bs-491590-390811-392152-carb-fits-191700-192700-193700-engine-series-vertical-engine-with-gasket-air-filter-fuel-filter-spark-plug-kit","provider":"BlueStars Parts","version":"1.0","type":"link"}