Snowmobile won’t stay running 

did you even try to use a gravity Fuel Tank ? I always keep one handy for first start-up after long time sitting. If a temp gravity tank does keep it running then you have pin-pointed the problem and can easily work back from there. Sometimes a coil can stop functioning when warmed up too?

I have a arctic cat panther that ran really bad and I found out that you need the air silencer connected to the carb other wise it runs really bad

Gonna try to put a new fuel pump on mine. Everything else was good. I have to pull it 10 times before it runs for a few seconds or so. Other than that...I'm not certain. Otherwsise...I'll just take it in to the shop.

Having the same issue with my sled. Any luck with your fixes?

try new seals i just put all new seals in my pantera 500, had the same issue

Look at the air mix screw on the side of the carb