Husqvarna LC121 Push Mower cut-off mid cut after running over an object

[destrymurray]

My LC121 push mower cut off mid cut after hitting something (what I think is a small piece of concrete). It didn't stop immediately, but a few seconds after which was simultaneous with a little black smoke. The flywheel still has the normal tension and the blade spins when using the pull string, but after releasing the string after a pull, the fly wheel and blade continue to spin but no spark or engine turn-over is generated. Almost like something was damaged on the crank shaft, but I have not gotten that far into investigating yet. I thought the issue was a broken flywheel key shear pin, but the pin is intact with no notable damage. Anyone run into something similar?

 

[mechanic mark]

I believe you nailed it remove flywheel & key & inspect.