If the bike ran good this summer then a simple main jet needle adjustment should work good in the cooler weather.
Remove the top of the carb. remove the needle from the slide and drop the clip down one notch on the needle and reinstall. This will richen it up a bit. run and test. You may want to drop an additional notch depending on your condition.
Move the clip down on the needle and it will make a richer condition. Move the clip up on the needle and will make a leaner running condition.
Dont forget to put it back in the summer.
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yeah, that cold would require bigger jets. Sorry, I dont know the sizes off the top of my head. It would be determined on altitude and what climate it was tuned for to begin with.
If it was mine I would change both low speed and main jets to bigger. Again its hard for me to give you anything exact cause I dont know what jets are in it now or what climate it was tuned for to begin with. If it ran good in 60+ degrees F and its now 0 degrees F -n I would start with 2 sizes bigger on both and go from there. There are a lot of variables to consider when tuning in a carb.
Also I would see if I could get the unit running on a prime first before messing with carb settings just to be sure there is not another problem
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... my mistake ... cold at minus 15... never start...my right leg is almost double size from my left...lollll
i put both choke reg and the hot... nothing !!!
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maybe close 1/4 air screw, and i am sorry my english is not very good...or put bigger slow jet
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