Briggs Stratton 691428 Main Jet Carburetor Part

Product Description

The BRIGGS STRATTON 691428 is a main jet designed for use in small engine carburetors. The main jet is a precision-metered orifice that controls the fuel-to-air ratio at mid to high throttle positions, directly affecting engine performance and combustion efficiency. This OEM-specification component is installed by small engine technicians and outdoor power equipment service professionals during carburetor rebuilds or fuel system repairs. Proper fuel metering depends on an undamaged, correctly sized jet, making this a critical replacement part when the original shows wear, varnish buildup, or damage from stale fuel.

This main jet is suited for residential and light commercial outdoor power equipment applications. It is a common service part used during carburetor cleaning, overhaul, or replacement on lawn and garden equipment such as walk-behind mowers, riding mowers, and similar small-engine-powered machines that use BRIGGS STRATTON engines and matching carburetor assemblies. Technicians typically replace the main jet when fuel delivery issues or rough running cannot be resolved through cleaning alone.

Key Features

• OEM-specification main jet for precise fuel metering in BRIGGS STRATTON carburetors
• Controls fuel-to-air mixture at mid to high throttle range
• Targeted replacement for carburetors affected by varnish deposits or jet wear
• Engineered to restore factory fuel delivery performance
• Compact, direct-fit design for efficient carburetor service

Compatibility

Designed as an OEM-style replacement main jet for BRIGGS STRATTON small engine carburetors used in lawn and garden power equipment.

Installation Notes

Main jet replacement is performed by qualified small engine technicians during carburetor service. Shut off the fuel supply valve and allow the engine to cool completely before disassembling the carburetor. Use the correct screwdriver or jet tool to avoid stripping the soft brass threads on the jet. Follow applicable small engine service procedures and local regulations for handling and disposing of fuel system components.

Technical Specifications

• Component Type: Main Jet
• Application: Small Engine Carburetor

Standard Information

• Brand: BRIGGS STRATTON
• Manufacturer Part Number: 691428