Help needed

i just poped in a bigger carb an it starts on it own but still runs the same , im beyond lost with this thing , i think weve ruled it , being a carb issue , being as if tried it 3 different carbs in it
 
I'm new to Blasters but I do have experience with smaller 2 strokes. Sooo...I'll give it a shot. You've ruled out the carb and if comp is good? it should be a weak spark issue. The stator is weak, plug, cdi or coil. IMO