Briggs Stratton 555778 Fan Flywheel

Product Description

The BRIGGS STRATTON 555778 is a fan flywheel designed for use in small gasoline engines manufactured by Briggs and Stratton. The flywheel serves a dual role: it stores rotational energy to keep the engine running smoothly between power strokes, and its integral fan fins draw cooling air across the engine block and cylinder head to prevent overheating during operation. This part is a direct OEM replacement intended for service technicians and equipment repair professionals working on Briggs and Stratton powered equipment.

This fan flywheel is used in lawn and garden power equipment powered by Briggs and Stratton small engines. Typical applications include walk-behind lawn mowers, riding mowers, generators, and similar outdoor power equipment. Installation is performed during engine top-end service, recoil starter repair, or when the original flywheel is damaged, cracked, or has stripped keyway slots.

Key Features

• OEM Briggs and Stratton replacement fan flywheel for direct fitment
• Integrated cooling fins circulate air across the engine to manage operating temperature
• Stores rotational energy to smooth engine power delivery between firing strokes
• Designed to interface with the crankshaft keyway for precise ignition timing alignment

Compatibility

Designed as an OEM-style replacement fan flywheel for Briggs and Stratton small gasoline engines used in lawn and garden power equipment.

Installation Notes

Flywheel service should be performed by a qualified small engine technician. Before beginning work, disconnect the spark plug wire and allow the engine to cool completely. A flywheel puller tool is required for safe removal — never strike the flywheel or crankshaft directly. Inspect the crankshaft keyway and flywheel key for shear damage before installing the replacement, as a damaged key will cause ignition timing faults.

Technical Specifications

• Part Type: Fan Flywheel
• Application: Briggs and Stratton Small Gasoline Engines

Standard Information

• Brand: BRIGGS STRATTON
• Manufacturer Part Number: 555778