First take the intake off and seal it with a good rtv sealant, than lower the carb clip a notch or two. If the engine is warm and you still can't idle it with the adjusting screw without having the choke on, try lowering the clip another notch. You want to try to run it a little richer on the air/fuel mixture. Small 2 strokes run hot when lean.
BTW- Check out other areas of these forums for other great info !!!
I learnt a pile from these guys who have been building them for awhile !!