Briggs & Stratton 5 Pack 222698S Flywheel Key Replaces 61760/690974/555054

What It Is

This is a 5-pack of OEM Briggs & Stratton flywheel keys (part number 222698S), used to align the flywheel to the crankshaft on small engines. It’s a common replacement part when a key shears off during sudden engine stop, such as hitting a solid object or debris.

Fitment & Compatibility

Before buying, verify your engine’s model number (found on the valve cover or blower housing). This key fits most Briggs & Stratton single-cylinder engines with a 1-inch crankshaft diameter, including many push mowers, lawn tractors, and generators. It replaces OEM numbers 61760, 690974, and 555054. Measure the key slot width (typically 1/8 inch) and length (about 1 inch) to confirm. Not for engines with a 7/8-inch or 3/4-inch crankshaft, or for non-Briggs engines without cross-reference.

Key Things to Know

• Quality: OEM part, so it matches factory specs—no filing or adjustment needed. Aftermarket keys may be slightly softer and shear again faster.
• Installation difficulty: Easy for anyone comfortable removing a flywheel nut and using a puller. No special tools beyond a socket and torque wrench (torque flywheel nut to spec: typically 65-85 ft-lbs).
• Common gotcha: Always check the crankshaft keyway for burrs or damage before installing. If the key sheared due to blade impact, inspect the blade adapter and crankshaft for cracks—replacing just the key may not fix the root cause.
• 5-pack value: You get spares for future shears, but most users only need one. Keep extras on hand if you mow over debris regularly.

Should You Buy It

If you have a Briggs engine with a 1-inch crankshaft and need a quick, reliable fix for a sheared flywheel key, this OEM 5-pack is a solid buy—especially if you want spares or maintain multiple mowers. Skip it for non-Briggs engines or if you can find a single key cheaper locally.