Carburetor Compatible for Briggs & Stratton 792945 266 405777 406777 407777 446677 445577 441777 442577 40G777 40H777 446777 499804 593392 44677A 407677 40F77 4R877 593392 20HP 21HP 23HP 24HP 25HP

What It Is

This is an aftermarket carburetor designed to replace OEM Briggs & Stratton units on single-cylinder and V-twin engines from 20HP to 25HP. It handles fuel mixing and delivery for push mowers, riders, zero-turns, and lawn tractors.

Fitment & Compatibility

Before buying, verify your engine’s model number (not just HP or deck size). This carburetor cross-references OEM numbers: 792945, 266 (various suffixes), 405777, 406777, 407777, 446777, 445577, 441777, 442577, 40G777, 40H777, 446677, 44677A, 407677, 40F77, 4R877, 499804, and 593392. It fits many Briggs & Stratton engines with 1.5” or 2” intake bore and side-mount fuel bowls. Check your engine’s mounting bolt pattern (usually two bolts spaced 3” or 3.5” apart). Measure your old carb’s bowl diameter and fuel inlet size (typically 3/16” or 1/4”). If your engine has a different choke linkage or governor arm style, you may need to reuse your original parts. Not compatible with OHV engines using a plastic intake manifold or those with integrated fuel pumps.

Key Things to Know

• Quality variance: Aftermarket carburetors often have slightly thinner gaskets or less precise jets than OEM. Expect to adjust the mixture screw (if adjustable) after installation.
• Installation difficulty: Moderate. You’ll need basic tools (screwdrivers, socket set) and patience with linkage alignment. Plan 30–60 minutes.
• Common gotchas: The supplied gaskets may leak if over-tightened. Use a light coat of oil on gaskets and torque bolts to 30–50 in-lbs. If the engine runs rough, clean the new carb’s jets—debris from manufacturing is common.
• Return policy: Since it’s a budget part, confirm the seller’s return window. Many require you to test-fit within 30 days.

Should You Buy It

Buy this if you have a confirmed compatible Briggs engine, you’re comfortable with minor adjustments, and you want a low-cost fix ($32) rather than a $80+ OEM unit. Skip it if you need exact OEM performance for sensitive applications (e.g., commercial mowing) or if your engine has a non-standard linkage that can’t be adapted.