I need help understanding the mechanical choking in this unit, we have had several that just dont choke enough by themselves (especially when its cold) but by manually manipulating the choke can get them to start right up and once it starts, starts over and over. Let it sit overnight and overcrank again, Ive asked the manufacturer and all they seem to be able to tell me is that its mechanical, that Ive already deducted, but how does it work? Does the govonor shaft retreat to a position upon shutting down that allows the choke to close....Any input would be greatly appreciated