799583 Carburetor for 300E 450E 500E 550E 550EX 08P502 8P502 09P602 9P602 Series Engines Replace 593261 595656 591979 591160 Carb with 799579 Air Filter Tune Up Kit

What It Is

This is a complete carburetor replacement and tune-up kit for Briggs & Stratton 300E, 450E, 500E, 550E, 550EX, 08P502, 8P502, 09P602, and 9P602 series engines. It includes the carburetor, gaskets, and a 799579 air filter—everything needed to restore fuel delivery on walk-behind mowers, pressure washers, and other small equipment using those engine families.

Fitment & Compatibility

• Engine series only: Works with the listed Briggs & Stratton E-series (300E–550EX) and P-series (8P502, 9P602) engines. Does not fit other Briggs models like Intek, Vanguard, or older flatheads.
• OEM cross-references: Replaces Briggs part numbers 593261, 595656, 591979, and 591160. If your current carburetor has one of these stamped on it, this is a direct swap.
• What to measure: Check the carburetor mounting bolt spacing (center-to-center) – should be 2.75 inches. Also verify the fuel inlet barb diameter (usually 5/16-inch) and the choke linkage style matches your engine.
• Deck size irrelevant: This part fits the engine, not the mower deck. Ignore deck width; focus on the engine model number (found on the valve cover or blower housing).

Key Things to Know

• Installation difficulty: Moderate. Expect 30–60 minutes. You’ll need a socket set, screwdriver, and possibly a small fuel line clamp. No special tools required.
• Common gotcha: The included gaskets may be slightly thicker than OEM. Use a thin film of grease to hold them in place during assembly—don’t over-tighten the mounting bolts or you’ll warp the carburetor body.
• Air filter included: The 799579 filter is a direct fit for the listed engines. Replace it at the same time for best results.
• Quality note: This is an aftermarket carburetor, not OEM. Most users report it runs well out of the box, but you may need to adjust the idle mixture screw (turn 1.5 turns out as a starting point).

Should You Buy It

If your Briggs E-series or P-series engine is surging, hard to start, or won’t run at all with a dirty carburetor, this kit is a cost-effective fix. It’s ideal for DIYers who want a complete drop-in replacement without rebuilding the old carb. Avoid it if you prefer OEM parts for commercial use or if your engine model isn’t in the listed series.