Chainsaw Repair

Hello everyone , sort of new here and hope someone can help me out.

I recently was given a MS192 that jumped out of a tree. It had the case  , recoil and brake / sprocket cover smashed. I replaced all the plastic but now it just won't stay running. It fires right up and idles fine and accelerates fine for the first minute or so and then looses it's acceleration and dies out. I have rebuilt the carb  (zama) and can't see anything wrong with it however the adjustment screws do not seem to do a heck of a lot when you adjust them. If I understand correctly some of theese carbs are just junk no matter what you do to them. I have been around and fixing power equipment for over 30 years and just can't seem to figure this one out. New Carb?  Thanks in advance for any help.

As the 192T warms up, the there is a air leak, or pinched fuel line or gas line situation.

Another place to check is the tank vent? Confirm this by opening the gas cap when the saw stalls out on you?

Look around the carb intake manifold boot for cracks that open when stretched or for loose connections.

I think the vent on the 192T is standing up exposed in the carb air box area?

Well no changes , still starts and runs great for maybe a minute or so and then cuts out on what seems like a lean condition. I have been through everything multiple times and still the same thing. Checked for broken fuel lines , vent clear and working , carb cleaned and new kit installed. Only thing left that I can figure would be a crank seal that starts to leak as it warms up. Sounds like this might not be the first posting here with the same symptoms. Saw was free and don't have all that much money into it but the aggrivation it has caused makes me think a new one would have been the way to go.