796587 Carburetor Carb Replacement For BS 500cc 17.5hp 19.5 19HP 594492 24181817 592952 33R877 331707 331777 331877 591736 794136 31Q677 33M977 Craftsman Riding Lawn Mower Tractor Carb

What It Is

This is a carburetor replacement for Briggs & Stratton 500cc single-cylinder engines (17.5 to 19.5 HP) used in riding mowers and tractors. It replaces OEM part numbers 594492, 24181817, 592952, 33R877, 331707, 331777, 331877, 591736, 794136, 31Q677, and 33M977. It’s a direct swap for a worn or clogged carb causing hard starting, surging, or poor power.

Fitment & Compatibility

Before buying, confirm your engine model number (stamped on valve cover or shroud, like 33R877 or 31Q677) matches one of the listed OEM numbers. This carb fits Briggs & Stratton 500cc engines (17.5–19.5 HP) on Craftsman riding mowers and tractors, but also works on some John Deere, MTD, and Husqvarna models using the same engine family. Measure your carb mounting bolt spacing (typically 2.5 inches center-to-center) and check that the fuel inlet diameter matches your line (usually 1/4-inch). Verify your air filter housing and throttle linkage style (pivot or fixed) are compatible—this carb uses a standard remote choke and throttle cable. It does not fit engines with a primer bulb or those requiring a different bowl nut size (check your old carb bowl nut for 7/16-inch hex).

Key Things to Know

• Quality: aftermarket budget pick – This is a non-OEM replacement. Expect gaskets to seal fine but jets may need adjustment. Clean out any debris from shipping before install.
• Install difficulty: moderate – You’ll need basic tools (screwdrivers, wrenches) and patience to adjust the idle and mixture screws. No special skills required, but plan 30–60 minutes.
• Common gotcha: throttle linkage – The throttle arm on this carb may not match your original’s orientation. You may need to reuse your old linkage parts or bend the new arm slightly. Also, the float bowl screw can strip easily—use a snug hand-tighten only.
• Fuel line and gasket check – Replace the fuel line if it’s brittle. Use included gaskets, but add a thin layer of gas-resistant sealant on the intake gasket for a leak-proof fit.

Should You Buy It

If you have a Briggs 500cc engine (17.5–19.5 HP) with one of the listed OEM numbers and your original carb is beyond cleaning (stuck float, corroded body), this is a cheap fix at $24.95. It’s not for pros needing OE reliability, but it works fine for DIYers on a budget—just expect minor linkage tweaks and be ready to tune the idle mix. Good value for a weekend repair.