595627 Carburetor For Briggs Stratton 44S977 44S877 44S677 44S577 40S777 20Hp 21HP V-Twin Intek Engine With Fuel Pump

What It Is

This is a complete aftermarket carburetor assembly with an integrated fuel pump, designed to replace the OEM carb on Briggs & Stratton V-Twin Intek engines used in riding mowers, zero-turns, and tractors (typically 20–21 HP).

Fitment & Compatibility

Before buying, confirm your engine model number (e.g., 44S977, 44S877, 44S677, 44S577, 40S777) is listed—this carb fits all those. Also verify your engine has a side-mount fuel pump integrated into the carb body (common on Intek V-twins). Check the mounting bolt spacing (usually 3.25" center-to-center) and the fuel inlet/outlet size (typically 1/4" barb). This is an aftermarket part, not OEM Briggs & Stratton, so expect slight variations in gasket thickness or choke linkage. If your mower is a brand like John Deere, Cub Cadet, Husqvarna, or Craftsman with one of those engines, it should fit.

Key Things to Know

• Quality is mixed – The 3.5/5 rating reflects occasional issues with float adjustment or debris in the fuel passages. Inspect and clean before installation.
• Installation is moderate – You’ll need to remove the air filter housing, disconnect fuel lines, and swap the linkage. Expect 30–60 minutes. Keep the old gaskets for comparison.
• Common gotchas – The fuel pump diaphragm may need priming; the choke linkage might require bending to align. Also, aftermarket carbs often run slightly richer—consider adjusting the idle mixture screw if the engine hunts.
• Fuel pump included – This is a cost-saver vs. buying carb and pump separately, but verify the pump orientation matches your fuel line routing.

Should You Buy It

This is a budget-friendly option for DIYers who need a quick replacement for a worn or clogged carb and don’t mind minor tweaks. It’s not for pros or those wanting OEM reliability—if you’re sensitive to fitment quirks or need zero downtime, spend more on a genuine Briggs carb. Otherwise, it’ll get your mower running again for half the price.