Jetting for 1999 Arctic cat z snopro 440

Hi i have a 1999 Arctic cat z snopro 440 fan cooled i was wondering if i should jet it or change something with the carb because it'll start fine and run but once it get warmed up it bogs really bad in low end and will barely move but if u can keep it going full speed its fine. i am mainly running it in like -20°