799583 Carburetor Fit for Briggs and Stratton Lawnmower engine 300E 450E 500E 550EX 500 125cc 140cc 08P502 8P502 09P602 9P602, for 593261 595656 591979 591160

What It Is

This is an aftermarket carburetor designed to replace the fuel metering assembly on Briggs & Stratton single-cylinder lawn mower engines in the 125cc to 140cc range. It’s meant for push mowers, not riding mowers or commercial zero-turns.

Fitment & Compatibility

Before buying, confirm your engine’s model number (e.g., 08P502, 09P602) – not the mower brand or deck size. The carburetor fits Briggs 300E, 450E, 500E, 550EX, and 500 series engines with those specific codes. It also cross-references OEM part numbers 593261, 595656, 591979, and 591160. Measure the mounting flange hole spacing: it should be roughly 2.5 inches center-to-center. If your engine uses a different bolt pattern (e.g., 3.0 inches), this won’t work. Check that your existing fuel line diameter matches (usually 1/4 inch). This is a non-OEM part, so seals and gaskets may vary slightly in thickness.

Key Things to Know

• Quality variance: Aftermarket carburetors often have slightly thinner gaskets or looser tolerances than OEM. Expect to fine-tune the idle mixture screw (if adjustable) after install.
• Installation difficulty: Moderate. You’ll need to remove the air filter housing, fuel line, and throttle linkage. Have a small flathead screwdriver and a 10mm socket ready. Estimate 20-40 minutes total.
• Common gotcha: The included gaskets may not seal perfectly. If the engine runs lean or stalls, replace them with OEM gaskets (Briggs part 692319) for a better fit. Also, check the float bowl for debris before installing – some aftermarket units arrive with metal shavings.
• Fuel compatibility: Works with standard unleaded gas (E10 okay). If you use ethanol-free fuel, expect slightly longer lifespan from the rubber seals.

Should You Buy It

If your Briggs engine is bogging, surging, or won’t start due to a clogged original carb, this $12.99 replacement is a cost-effective fix – especially for older mowers where OEM parts cost triple. Skip it if you want a perfect drop-in with zero adjustment, or if your engine model isn’t in the listed range. For DIYers with basic mechanical skills, it’s a solid budget choice.