791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709
791230 carburetor tune-up kit with fuel pump, oil filter, air filters, spark plugs, and gaskets for V-Twin engines.
791230 carburetor replacement showing dimensional measurements for B&S 20-25 HP V-Twin engines.
791230 carburetor replacement for B&S V-Twin engines shown with engine repair installation graphic.
Two views of a 791230 aluminum alloy carburetor for Briggs & Stratton V-Twin engines.
Infographic showing wide application of 791230 carburetor kit for tractors, lawn mowers, and zero-turn mowers.
791230 carburetor and fuel pump kit for Briggs & Stratton V-Twin engines.
791230 carburetor replacement part for V-Twin engines shown in a lifestyle graphic with a farmer and tractor.
791230 carburetor tune-up kit with fuel pump, oil filter, air filters, spark plugs, and gaskets for V-Twin engines.
791230 carburetor replacement showing dimensional measurements for B&S 20-25 HP V-Twin engines.
791230 carburetor replacement for B&S V-Twin engines shown with engine repair installation graphic.
Two views of a 791230 aluminum alloy carburetor for Briggs & Stratton V-Twin engines.
Infographic showing wide application of 791230 carburetor kit for tractors, lawn mowers, and zero-turn mowers.
791230 carburetor and fuel pump kit for Briggs & Stratton V-Twin engines.
791230 carburetor replacement part for V-Twin engines shown in a lifestyle graphic with a farmer and tractor.

791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709

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791230 Carburetor Kit

Key Features

  • Optimized Fuel Calibration: Precision-jetted for V-Twin engines, ensuring a consistent air-fuel mixture for smooth idling and full-throttle performance under load.
  • Pre-Installed Fuel Solenoid: Includes the 12V anti-backfire solenoid to prevent fuel from entering the engine after shut-off, reducing "popping" and carbon buildup.
  • Corrosion-Resistant Alloy: Manufactured from high-grade aluminum alloy to resist fuel degradation and ethanol-related corrosion common in modern pump gas.
  • Complete Service Kit: 1x 791230 Carburetor, 1x Oil Filter, 2x Fuel Filters, 1x Fuel Pump, 1x Air Filter & Pre Filter Set, 2x Spark Plugs, 7x Gaskets, 2x Screws.

Replaces / Cross-Reference Part Numbers

  • Briggs & Stratton: 791230, 799230, 699709, 499804, 497586.
  • John Deere: MIA10632, LG791230.
  • Stens: 520-960.

Compatibility & Fitment

This carburetor is designed for 4-cycle V-Twin engines typically found in riding lawn mowers and garden tractors. Key compatible models include:

  • Briggs & Stratton Engines: 405777, 406777, 407777, 441777, 445677, 445577, 445777, 445877.
  • John Deere Riding Mowers: LA120, LA130, LA135, LA140, LA145, LA150, L120, L130.
  • Other Brands: Fits select Craftsman, Husqvarna, and Poulan Pro tractors equipped with B&S 20HP to 25HP V-Twin engines.

When to Replace

  • Engine Won't Start: The engine turns over but fails to fire, often due to clogged internal jets or a failed fuel solenoid.
  • Surging/Hunting: The engine RPM fluctuates at idle or full throttle, indicating a lean condition or restricted fuel flow.
  • Leaking Fuel: Gasoline is dripping from the carburetor throat or the air filter housing, suggesting a stuck float or worn needle valve.
  • Backfiring: Occurs when the engine is shut off, typically signaling a faulty anti-backfire solenoid.
  • Black Smoke: Excessive fuel is entering the combustion chamber, indicating a "rich" condition or a heavy, non-buoyant float.

Installation Tips

  • Safety First: Work in a well-ventilated area. Disconnect the spark plug wires and the battery's negative terminal before starting.
  • Drain the Fuel: Pinch off the fuel line or drain the gas tank to prevent spilling during the swap. Always replace the fuel filter included in the kit.
  • Gasket Sealing: Ensure the mounting surfaces are perfectly clean. Scrape away old gasket material to prevent vacuum leaks that cause surging.
  • Solenoid Connection: Verify the 12V lead to the anti-backfire solenoid is clean and tight; a loose connection will prevent fuel from reaching the engine.
  • Fresh Fuel: Always use fresh, stabilized fuel (87 octane or higher) and consider using an ethanol treatment to extend the life of the new carburetor.
791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 1
791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 2
791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 3
791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 4
  • 791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 1

    Fixing symptoms

    Popping/ banging/ sneezing sounds | Excessive exhaust | Starting difficulties | Idling issues | Carburetor floods
  • 791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 2

    Premium Quality

    It is crafted from a lightweight and robust Aluminum Alloy that offers a favorable strength-to-weight ratio
  • 791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 3

    Saving solution

    BlueStars brings DIY solutions to help you deal with any trouble
  • 791230 Carburetor Kit for B&S 445677 405777, J-Deere LA120 LA130 - Replaces 799230 699709 4

    Simple installation

    Please follow our instructions in the below image or ask us for help!
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Compatible Models

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FAQs

This carburetor kit is commonly used on Briggs & Stratton 20-25 HP 4-cycle V-twin engines in the 400000 and 440000 series, including engine model families such as 405777, 406777, 407777, 407677, 441777, 445677, 445777, 446777, 40F777, 40G777, and 40H777. It is also associated with John Deere applications using part number MIA10632, including LA120, LA130, LA135, LA140, LA145, LA150, and some listings also reference L120, L111, L118, Z255, and Z425. Some cross-listings also mention Husqvarna models such as YTH22V46 and YTH2348. The safest way to confirm fit is by matching both your engine model number and the carburetor part number.
The listed replacement numbers are 791230, 799230, 699709, 499804, and John Deere MIA10632. Additional cross-reference listings also mention 796227. Matching the old carburetor number and your engine model is the best way to verify compatibility before ordering.
Typical carburetor-related symptoms include hard starting, needing choke to keep running, rough idle, surging, black smoke, fuel flooding, poor throttle response, or stalling under load. On 20-25 HP Briggs & Stratton V-twin engines, these problems are often caused by varnish buildup in the jets, a sticking float needle, debris from an aging fuel line, or fuel left sitting in the mower for a long period.
For most lawn tractor owners, this is usually a moderate repair. Plan on about 30-90 minutes depending on access and whether the air intake and fuel lines are stuck or brittle. Common tools include a socket set, screwdrivers, needle-nose pliers, and hose-clamp pliers. Before removal, take clear photos of the throttle linkage, governor linkage, fuel line routing, and any breather or vacuum connections so everything goes back in the correct position.
Before installing a new carburetor, check the fuel quality, fuel filter, fuel lines, air filter, spark plugs, and the intake gaskets. Old fuel, ethanol-related deposits, cracked fuel lines, or a dirty air filter can cause symptoms that look like carburetor failure. If the engine has been flooding, also inspect the fuel shutoff system if equipped and make sure debris from the tank is not repeatedly contaminating the new carburetor.
The most common cause is stale gasoline, especially ethanol-blended fuel that absorbs moisture and leaves deposits in the float bowl and metering passages. Long off-season storage, dirty fuel tanks, and deteriorating rubber fuel lines can also send debris into the carburetor. On mower engines, heat and vibration over time can also harden gaskets and affect sealing, which contributes to lean running, surging, or fuel leaks.