The Honda 13311-Z9L-860 Lawn Mower Crankshaft converts the piston's up-and-down movement into rotational motion to drive the engine. It serves as a key internal component, helping transfer power through the engine's rotating assembly for consistent operation. A properly functioning crankshaft supports smooth engine performance and reliable power delivery. Replacing a worn or damaged c... https://www.wholetoolbox.com/honda-13311-z9l-860-lawn-mower-crankshaft/13311-Z9L-860.html