Carb or Ignition adjustment?

[Dm1pfoy1]

So I have barry grant 750 dp carb and I have a issue im not able to figure out.

So under throttle 50% or better rpms can be as low as 1k there will be a flash/pop (much quieter than carb or engine backfire) almost like a cough on cold start.It will cut power for moment and recover without dying (typically i let off throttle).

I think im over fueling or not enough timing but its rich to point it will gas me out of garage so not leaning out and there is no ping that would lead to believe its lean either.

Does anyone have reliable info on how to 4 post tune carb and tune ignition?Really need help this is first 4 post I have had.

Running 4* static/idle timing i dont have dial light to test high end of timing
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