Bilz, Since no one responded...I do not know the machine, but the symptom is fuel starvation when the butterfly allows a surge of air. The mix goes too lean and will not burn. Try working on the secondary jet -clean ,open, Also look at the float setting . A carb detail dwg would help. I have seen them on line. On car carbs that transition from idle to accelerate is helped by a pump (jet), but I bet the little engine carbs are much simpler.
