Carbhub 591137 Carburetor for 591137 590948 775EX Lawn Mower Engine Carb 795066 796254 with Air Filter - 590948 775EX Carb

What It Is

This is a complete carburetor assembly (part number 591137) designed for Briggs & Stratton 775EX and similar single-cylinder lawn mower engines. It includes the carburetor, air filter, and gaskets—everything needed to replace a clogged or failing carburetor on walk-behind mowers, typically in 140cc to 190cc range.

Fitment & Compatibility

Check your engine’s model number (stamped on the valve cover or blower housing). This carb fits Briggs & Stratton engines using part numbers 591137, 590948, 795066, and 796254—most commonly the 775EX, but also some 675EX and 625EX variants. Do not rely on mower deck size or brand (Toro, Craftsman, etc.)—only the engine model matters. Measure the mounting bolt spacing (center-to-center) to confirm: it should be 2.5 inches. If your engine uses a primer bulb on the carb, this one has it integrated. Not compatible with engines that have a separate fuel pump or older side-draft carburetors.

Key Things to Know

• Quality vs OEM: This is an aftermarket carb, not Briggs & Stratton Genuine. Most users report it runs fine with minor tuning, but some get a rough idle or fuel leak if gaskets aren’t seated perfectly.
• Installation difficulty: Easy (30-45 minutes). Requires removing the air filter housing, old carb, and swapping fuel line. No special tools beyond a socket set and maybe a screwdriver.
• Common gotcha: The included air filter may be slightly thinner than OEM—check that it seals against the housing to avoid sucking unfiltered air. If the mower surges, adjust the idle screw (usually 1.5 turns out from closed).
• Fuel line size: The barb fits 1/4-inch ID fuel line. If your mower uses 5/32-inch line, you’ll need a short adapter or a new hose.

Should You Buy It

Buy this if your Briggs 775EX engine won’t start or runs poorly due to a clogged carb, and you want an affordable, complete replacement with basic hand tools. Skip it if you need exact OEM fitment for a commercial mower, or if your engine model number isn’t listed—then get the genuine Briggs carb for guaranteed compatibility.