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I'm going to say you'd be at about #30 pilots, needle 1 clip richer than stock (4th from blunt end) and 300 mains. I'm assuming Quebec is pretty low elevation near sea level. You'd be around 270 on the mains with the air box lid on in the summer. Basically if you have had it correctly jetted with the PTR's for the summer, add one size on the main jets for every 20-30 degrees coldeer it is now. I figured about 80 degrees colder so go up about 3 sizes on the mains compared to summer jetting. This is an approximation. You still need to to a plug chop to verify your jetting, or go bigger on the mains untill it bogs at WOT in the taller gears then go down one size on the mains to where it doesn't bog. This would put your main jetting at a safely rich setting. It is always a good idea to error on the rich side.

 

Read how to do a plug chop Here

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