Lawn Mower Engine Carburetor for 300E 450E 500E 550EX 500 125cc 140cc 08P502 8P502 09P602 9P602, Replace OE Part # 799583 593261 595656 591979 591160

What It Is

This is an aftermarket carburetor designed for small single-cylinder engines (125cc–140cc) found on many Craftsman, Husqvarna, and other push mowers. It replaces the factory carb on models like 300E, 450E, 500E, 550EX, and engines with codes 08P502, 8P502, 09P602, or 9P602.

Fitment & Compatibility

Before buying, confirm your engine’s model and type numbers (stamped on the engine shroud or valve cover). This carburetor fits Briggs & Stratton 500 series engines (125cc and 140cc) with the listed OE part numbers. Measure the mounting bolt spacing (center-to-center) – it should be roughly 2.5 inches. Also check the fuel line diameter (typically 1/4 inch) and throttle/choke cable connection style. It will not fit engines with a different bolt pattern or larger displacement (e.g., 190cc). If your mower has a primer bulb, this carb may not include one – verify your mower’s fuel system type.

Key Things to Know

• Quality variance: It’s a budget-friendly aftermarket part, not OEM. Expect slightly thinner metal and plastic, but for ~$14 it’s a common, functional replacement.
• Installation difficulty: Moderate. You’ll need to swap the old gaskets (often included) and adjust the idle speed screw after install. A small screwdriver and pliers are usually enough.
• Common gotcha: The carb may arrive with debris or casting flash inside – blow out all passages with compressed air before mounting. Also, the included gaskets may not be exact; compare with your old ones.
• Fuel system note: If your mower sat with old gas, this won’t fix clogged fuel lines or a bad tank vent. Clean the entire fuel path for best results.

Should You Buy It

If your mower’s engine matches the fitment list and you’re comfortable with basic small-engine work, this is a cost-effective fix for a failing carburetor. It’s not for professional-grade longevity, but for a homeowner with a non-running mower, it’s a solid, low-risk gamble at $14. Skip it if you want OEM durability or need a carb for a different engine series.