The idle screws should be 1 1/2 turns out from the seat,give or take a 1/4 turn and there should be about .040 of the transfer slot showing.
Set your carb to these settings and it should idle. If not than you have to address the problem.
As others have said, the exhaust is way too restrictive and the carb is too small. The cam is too big and the gear is wrong. I know those are the winter projects, but they will make a huge difference.
