Briggs & Stratton flywheel key. The flywheel key aligns the flywheel in the correct position on the crankshaft. If the engine stops suddenly due to hitting a hard object, the flywheel key shears in half to prevent damage to the engine. If the flywheel key is broken, the engine won't start.
Pawl Friction Plate. This part does not include the screw or spring, please see related items.
Briggs and Stratton repair manual. Single cylinder 'L' head engines built after 1981.