Key Features

• Genuine Briggs & Stratton OEM Main Jet Fuel Assembly Module (Part 596521) designed for Briggs & Stratton carburettors, ensuring accurate fit and long-term reliability.
• Precision fuel delivery: controls fuel flow into the carburettor to sustain a consistent fuel-to-air ratio, supporting smooth idle and responsive throttle.
• Direct replacement that supersedes original fuel module assemblies 592804 and 595648, simplifying carburettor servicing or rebuilds.
• Durable construction to withstand typical lawnmower and outdoor power equipment operation.
• Critical metering function that maintains correct fuel-to-air ratio during idle and under load, reducing hesitation and stalling from fuel-delivery issues.

Product Details

• Part: 596521 Main Jet Fuel Assembly Module (fuel module / main jet module)
• Function: Part of the carburettor's fuel metering system; regulates the fuel delivered to the engine for efficient combustion and smooth operation.
• Quality: Genuine Briggs & Stratton OEM component designed to meet exact specifications.
• Replacement note: Designed to replace original fuel module assemblies; common upgrade path during carburettor servicing or rebuilds; supersedes 592804 and 595648.
• Construction and durability: Built to withstand typical operating conditions on lawnmowers and outdoor power equipment.
• Installation guidance: Verify engine model, type, and code to ensure correct match; improper fit can affect metering performance.

Compatibility

• Commonly used on selected Briggs & Stratton 125cc and 450E series engines produced before the specified code dates.
• To confirm fit, check your engine's model, type, and code for an exact match with part 596521.