Man Peoples just don't like cold weather. I'm convinced of it. Especially in stock form. I bought mine new in 2010 and it's always been cold blooded. And I live in NC! I remember several times I
could not get my people started right after I bought it. The colder the weather and the longer it sat it just bitched and moaned even more. For example just a mid 30s morning and hasn't been started in 5 days it would struggle.
That damn auto-choke sucks. That's part of the problem. There is a procedure for checking the auto-choke in the manual I believe. If not search zombies threads. He mentioned it several times. Might be worthwhile or might be nothing wrong with it.
Other than that I can offer you a few tips.
First off, on cold mornings use the kick start instead of electric. The starter draws a lot of power. Power the ignition needs on a cold morning.
Second,
do not touch the throttle. It's counter intuitive I know. But from my experience it just makes things worse.
Third is, try putting a cap full or two of Seafoam in the tank every fill up. Will keep the gas loose and fresh.
Fourth is start putting some mods on that thing. Open her up. She can't breathe! Seriously, every mod I've done has made it easier to start. By far the thing that improved it the most is the Dellorto carb with a
manual choke.
Two strokes are strange, fascinating creatures. I own a couple 2 stroke scooters and a couple 2 stroke quads. I love 2 strokes but I've learned they like to be ran periodically. Some more than others...
I've gone 2 months without starting my Yamaha Blaster and had it start on the first kick. Other times I let it sit and it doesn't even want to try without wearing my leg out. So I guess my last tip would be to just start it at least once a week. Hope this helps