I am still getting this "four stroking" at bottom quarter throttle which seems to happen on the transition exactly between the transition of bottom quarter throttle and everything above that. It happens both on throttle up and throttle down past that line. Is this just a normal carb that happens even when perfectly dialed in?
I've attached an audio file I clipped off a few examples separated by silence to get some opinions. First sound bit is me holding throttle exactly on that spot for about 8 seconds, next two short bites are when it happens at throttle up, first really quick throttle up, then slower throttle up. Final bite after the last silence spacer is 30 seconds of somewhat normal driving where i am holding throttle at the four stroking spot to exaggerate the sound for you to hear the "four stroking" every time I throttle up or down past that first quarter line.
Am I even using the right term of "four stroking"?
This was all recorded with the current jetting of 40/120 idle at 3.75 half turns out and 120/be4/97MJ.