The Echo A011001390 Crankshaft converts the piston's reciprocating motion into rotational movement to power the engine's operation. Positioned within the engine, it works with the connecting rod to transfer force generated during combustion to the rotating assembly. Proper crankshaft function supports smooth engine operation and consistent power delivery. Replacing a damaged or worn c... https://www.wholetoolbox.com/echo-a011001390-crankshaft/A011001390.html