594605 Carburetor Replaces 792768 591734 594603 594601 591736 796587 796250 795486 794136 For Briggs & Stratton 33M977 31Q677 331777 331707 331877 19.5 19HP Intek Motor Engine

What It Is

This is an aftermarket carburetor designed to replace OEM Briggs & Stratton part numbers 792768, 591734, and several others. It fits specific Briggs & Stratton Intek single-cylinder engines (models 33M977, 31Q677, 331777, 331707, 331877) commonly used on riding mowers, lawn tractors, and zero-turn mowers in the 19–19.5 HP range.

Fitment & Compatibility

• Engine model required: Check your engine’s model number (e.g., 33M977) – not just the mower brand. This carburetor will not fit engines outside the listed models.
• OEM cross-reference: Confirmed fits Briggs & Stratton OEM part numbers: 792768, 591734, 594603, 594601, 591736, 796587, 796250, 795486, 794136.
• Physical check: Measure the mounting bolt spacing (approx. 2.5 inches center-to-center) and the fuel inlet size (5/16” barb). Verify your engine has a side-draft intake and a single-barrel carburetor.
• Fuel system: Compatible with standard gravity-feed or pulse-pump fuel systems. Not for engines with electric fuel pumps without modification.

Key Things to Know

• Quality variance: Aftermarket carburetors often have slightly different jetting or tolerances than OEM. Expect to adjust the idle mixture screw (if adjustable) after installation.
• Installation difficulty: Moderate – you’ll need to remove the old carburetor, transfer the intake gasket and fuel line, and set the float height (typically 1/8” from the bowl rim). No special tools beyond a socket set and screwdriver.
• Common gotcha: The included gaskets may be thinner than OEM. If you get a vacuum leak (engine surges or won’t idle), use an OEM-style gasket or apply a thin layer of gasket sealant.
• Return policy: Aftermarket parts vary in fitment accuracy – buy from a seller with a clear return policy in case the carburetor doesn’t match your engine’s throttle linkage or governor arm.

Should You Buy It

This is a good budget fix for a non-starting or rough-running Intek engine if you’re comfortable with basic carburetor work. It’s not a perfect drop-in replacement – expect minor adjustments – but at $25.75, it’s a fraction of the OEM cost. Best for DIYers who can troubleshoot surging or idle issues. If you want zero-hassle fitment, buy the OEM Briggs & Stratton part instead.