A-B1796335-AI KEY-FLYWHEELOne New Aftermarket Replacement Flywheel Key Fits Briggs & Fits Stratton Small Engines This flywheel key (Woodruff style) seats in the crankshaft keyway to lock the flywheel in the correct position, ensuring accurate ignition timing and proper engine startup. A sheared or damaged flywheel key is a common cause of hard starting, backfiring, and timing problems on Fits Briggs & Fits Stratton powered lawn mowers, chipper shredders, and other outdoor