Panari 594593 17.5HP Carburetor for Brigg Stratten 591731 796109 31A507 15HP Engine 590400 796078 498811 794161 795477 594591 794572 699937 Lawnmower Carburetor after 2015

What It Is

This is a direct-replacement aftermarket carburetor designed for Briggs & Stratton single-cylinder engines in the 15–17.5HP range, commonly found on walk-behind lawnmowers built after 2015. It replaces dozens of OEM part numbers to restore proper fuel delivery when the original carb clogs or fails.

Fitment & Compatibility

Before buying, verify your engine’s model number (not the mower brand). This carb fits Briggs & Stratton engines in the 31A507, 31C707, 31P977, and 31R907 families, plus many other 15–17.5HP single-cylinder models. Cross-reference your OEM part number against the list: 591731, 796109, 590400, 796078, 498811, 794161, 795477, 594591, 794572, 699937. Measure the mounting stud spacing (center-to-center, typically 2.5 inches) and check that the fuel inlet and bowl size match your existing carb. It will not fit twin-cylinder engines, vertical-shaft engines over 20HP, or any mower built before 2015 without verifying exact compatibility.

Key Things to Know

• Quality vs OEM: This is a Chinese aftermarket unit, not a genuine Briggs & Stratton part. It often works fine but may require minor adjustment of the idle mixture screw or cleaning out manufacturing debris before installation.
• Installation difficulty: Moderate. You’ll need basic hand tools (socket set, screwdrivers) and should replace the gaskets (included). Expect 30–60 minutes if you’re handy; allow extra time if your engine has a plastic intake manifold that can crack.
• Common gotchas: The included gaskets may be slightly thinner than OEM—use a thin layer of gas-resistant sealant on the intake gasket if you get a vacuum leak. Also, the choke linkage may need bending to align perfectly; use the old carb as a reference.
• Warranty: Panari typically offers a 30-day return window, so test-fit immediately and confirm the engine runs smoothly before discarding packaging.

Should You Buy It

This is a great budget fix if your Briggs engine is hard-starting, surging, or won’t run due to a clogged carburetor, and you’re comfortable with basic engine work. It’s not for professional landscapers needing OEM reliability or for engines with damaged intake threads—those should get a genuine Briggs replacement. For DIY homeowners on a tight budget, it’s a solid value at $23.