Fremnily Carburetor for Quantum Briggs & Stratton Engines – Fits Most 3.5-6.5HP Lawn Mower and Generator Models


SKU B09L5N1RB9 Category


Need a replacement carburetor for your Briggs & Stratton Quantum engine? Search no further! This high-quality aftermarket carburetor by Fremnily is a perfect substitute for Briggs & Stratton part numbers 790845, 799871, 799866, 796707 and 794304.

Whether you need a carburetor rebuild or want to upgrade your existing carb, this unit will get your mower, generator or other outdoor power equipment running smoothly again.

Compatible With a Wide Range of Quantum Engines

This direct replacement carburetor has been engineered as a universal fit for most 3.5-6.5HP Briggs & Stratton Quantum engines commonly found on lawn mowers, generators, pressure washers, snow blowers and more. It’s an ideal carburetor upgrade or replacement for the following engines and equipment:

  • 625e and 675ex Series Engines
  • 725ex Series Engines
  • Most 122000 Model B and S Engines
  • 4-Cycle Lawn Mowers and Generators with Quantum Engines

Specific Briggs & Stratton engine models this carb is known to replace include:

  • 120000
  • 121000
  • 122000
  • 123000
  • 124000
  • 125000
  • 126000
  • 127000
  • 128000
  • 129000
  • 130000
  • 131000
  • 132000
  • 133000
  • 134000

It also fits many walk-behind mowers with the following model numbers:

  • JA60
  • JA62
  • JA65
  • Js20
  • Js25
  • Js35
  • Js26
  • Js36
  • Jm26
  • Jm36
  • Js28
  • Js38
  • JS40
  • JS45
  • JS60
  • JS61
  • JS63
  • JS63C
  • JS63E
  • MIA11798
  • MIA10750
  • MIA11189

Please double check your engine type and model number for compatibility before purchasing.

direct Replacement Carb with OEM-Level Quality

This aftermarket replacement carburetor matches the fit and performance of the original Briggs & Stratton parts. It’s made to meet or exceed OEM specs, featuring:

  • Precise fuel metering for smooth, reliable operation
  • Sturdy aluminum die cast construction
  • Quality gaskets and seals prevent air leaks
  • Adjustable carb settings to tune engine performance
  • Compatible with standard impulse and primer fuel lines

The carb comes ready to install right out of the box. All necessary gaskets, seals and hardware are included for a hassle-free repair.

Complete Carburetor Rebuild Kit – Includes Air Filter & Spark Plug

This Fremnily carb kit contains everything you need to overhaul your Briggs & Stratton Quantum engine carburetor and fuel system for peak performance:

  • Carburetor assembly
  • Fuel shut off valve
  • Fuel filter
  • Fuel line
  • Air filter
  • Pre-filter
  • Spark plug
  • Assorted gaskets
  • O-ring
  • Clamps
  • Primer bulb

Replacing old, worn out parts with new components ensures your small engine runs efficiently. Regular maintenance and tune-ups keep your equipment in top shape, extending the engine lifespan.

Easy to Install – Detailed Instructions Included

This replacement carburetor has been engineered to match OEM factory units, allowing for quick DIY installation. All necessary hardware and gaskets are in the kit. Detailed instructions are included to walk you through the carburetor swap process step-by-step.

With basic mechanical skills and standard hand tools, you can remove your old carb and install this new one in under an hour for most applications. No complicated carburetor adjustments needed!

Reliable Small Engine Performance

If your lawn mower, generator or other outdoor power equipment isn’t running smoothly, the carburetor is often the culprit. Installing this replacement carburetor from Fremnily helps restore engine performance and reliability.

You’ll enjoy easier cold starting, smoother idle, maximum power under load, reduced engine hesitation or stalling – all signs of a properly tuned carburetor.


  • Base Type: Carburetor Diaphragm
  • Material: Aluminum Alloy
  • Color: Silver Tone
  • Main Jet Size: 0.028 inch
  • Mounting Holes: 2 7/32 inch centers
  • Idle Hole: 0.039 inch
  • High Speed Hole: 0.052 inch
  • Carburetor Type: Floatless

Compatible Replacement For:

Briggs & Stratton – 790845, 799871, 799866, 796707, 794304

Satisfaction Guaranteed!

We stand behind our carburetors with a one year manufacturer’s warranty. We want you to be fully satisfied with your purchase. If you have any issues with fit, function or components, just contact us for support. Our friendly customer service team will work to make it right!

Grab this high quality Briggs & Stratton quantum engine carburetor for your equipment repair or upgrade needs. With proper maintenance, your small engine will run reliably for years to come. Order your replacement carb today!


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