Maybe for the initial take off the accelerator squirter is too large. You can look at the number on the squirter & go smaller in size (smaller number),or put the accerator cam on a less aggresive cam profile or change that plastic cam all together if it has the more aggresive cam on there.The plastic cams go by colors, what color is your cam?
What model carb is it & what size is it? Double pumper?
When your mech adjusted the air mixture screws, did it change the idle or anything when they were adjusting it?
