799583 Carburetor Replace OE Part # 590556 591160 591979 593261 595656 for 300E 450E 500E 550E 08P502 8P502 09P602 9P602 09P702 Engines Lawnmower 4-Cycle Outdoor Power Equipment with 799579 Air Filter

What It Is

This is an aftermarket carburetor that replaces several OEM part numbers for 4-cycle, single-cylinder engines commonly found on walk-behind mowers and outdoor power equipment. It delivers the correct fuel-air mixture to the engine and is designed as a direct swap for failed or clogged original carburetors.

Fitment & Compatibility

Check your engine model, not your mower brand. This carburetor fits Briggs & Stratton 300E, 450E, 500E, 550E, 08P502, 8P502, 09P602, 9P602, and 09P702 engines. It also replaces OEM part numbers 590556, 591160, 591979, 593261, and 595656.

What to verify before buying:

• Locate your engine model number (stamped on the blower housing or valve cover) – it’s not the mower deck model.
• Measure the carburetor mounting bolt spacing (center-to-center should be about 2.5 inches) and the fuel inlet fitting size (typically 3/16 inch).
• The kit includes the carburetor, gaskets, and a primer bulb – but not the 799579 air filter (sold separately). If you need a filter, buy it at the same time.
• Aftermarket carburetor – not OEM. Fitment is generally good, but some users report minor adjustments needed to the idle mixture screw.

Key Things to Know

• Quality is decent for the price – many users report it works out of the box, but a few have received units with stuck floats or debris in the bowl. Inspect before installing.
• Installation is straightforward – remove two bolts, swap gaskets, reconnect fuel lines and primer bulb. Expect 20–30 minutes for a first-timer. No special tools required.
• Common gotcha: The primer bulb may be slightly different from your original. Ensure it lines up with the air filter housing opening. If not, you may need to reuse your old bulb.
• Adjust the idle mixture screw after installation (turn it out 1.5 turns from fully closed as a baseline). If the engine hunts or stalls, fine-tune it 1/8 turn at a time.

Should You Buy It

This is a smart buy for anyone with a Briggs & Stratton 300E–700E series engine who needs to replace a clogged or failed carburetor on a budget. It’s not OEM quality, but at $19.99 it’s a fraction of the cost and works well for most mowers. Skip it if you want guaranteed fit and zero fuss – buy the OEM carburetor instead.