Does any body know what carb is in a kazuma cheetah 125cc and what stock main jet is and the same for a gy 125?

Possibly a Guangzhou Okaijia unit. I'm sure not even the manufacturer knows the jet size as it was probably drilled with whatever was at hand. Don't waste your time with it. Set the needle one notch lower and verify your float adjustment. continue to ride it while you order a real carb to replace that paper weight.