A-B1801234-AI KEY-FLYWHEELOne New Aftermarket Replacement Flywheel Key Fits Briggs and Stratton (B&S) Small Engines This flywheel key installs between the crankshaft and flywheel to maintain precise alignment and ensure accurate ignition timing in Fits Briggs and Stratton small engines. The key is designed to seat securely in the crankshaft keyway and eliminate play between the flywheel and crankshaft. It also serves as a sacrificial component if the mower blade strikes a hard