Honda 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.
Genuine OEM Part - Manufacturer #13331-357-000
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Key (25x18)
Genuine OEM Part - Manufacturer #13331-Z8B-900
Woodruff key
Genuine OEM Part - Manufacturer #94401-16120