yamaha warrior 350

So stock jet is 145 and is meant for around 70 degrees right? So what would be a good size jetting for around 40 degrees and what brand would be best?

Ok so I brought a 2002 Yamaha Warrior 350. The guy I brought it from had just got a new motor for it because his son let his friend ride and they went in some mud and that was the end of that. So he gave me the old motor and the new one, I just had to but the top end back together. So I did...