My cub cadet ZTR has this system as well on its 24hp kohler 7000 series.
It's called ReadyStart® and I'm not real happy with it.
My zero turn has that. If you pull it out of the shed and shut it off it won't re-start unless I let it sit. It's murder to start at low temps.
I just pulled the cover off my engine yesterday to look at the damn thing. Best I can guess is when I pull it out of the shed it warms up enough it won't start with choke but hasn't heated the bi-metal to override the spring.
As soon as the warranty is up I'm ripping all that poo off it and putting on an old fashioned choke knob. I might also look into a bigger jet so it's not so damn lean it won't start below 50 degrees.
I literally have to choke it to start it even after its run 2 hours. But ive never had an issue getting it to pop over even in extreme cold (i tried it last year at 5* just to see).
Although i think its called "smartstart" or something like that on mine.
Edited by DZG, October 10, 2017 - 08:33 AM.