Shop replacement repair parts for Lawn Boy Lawn Mower model S21ESNA

Lawn mower flywheel key (woodruff 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.

Filter Cover Retainer

Kit-charger battery

Ret ring


Screw

Screw


Washer-lock

Ring-retaining

Cable - control


Washer

Washer

Spring