Briggs & Stratton 594559 OEM Carburetor Main Jet Small Engine Fuel Metering Part

The Briggs & Stratton 594559 is a genuine OEM carburetor main jet designed for use in Briggs & Stratton small engine carburetors. The main jet is a precision-metered fuel orifice component located inside the carburetor that controls the flow of fuel into the engine under normal operating loads, ensuring the correct air-fuel mixture for reliable performance.

Key Features:

• Genuine OEM Part — manufactured by Briggs & Stratton to exact factory specifications
• Precision-Machined Orifice — delivers accurate fuel metering for consistent engine performance
• Direct Replacement — installs without modification, restoring proper carburetor function
• Durable Construction — built to withstand the demands of small engine applications including lawn mowers, generators, pressure washers, and more
• Part Number: 594559

A worn, corroded, or clogged main jet can cause hard starting, rough running, or loss of power. Replacing the main jet with a genuine Briggs & Stratton OEM part restores proper fuel delivery and helps extend carburetor life. Always verify fitment using your engine model, type, and code numbers before ordering.