by GTO Geoff » Sun Aug 28, 2022 7:01 am
Here is another thought, just thinking out loud.
Where are the pri blades at idle relative to the T slot? If more than 0.040" showing, you could try some bypass air. Easy to do if you a carb with adjustable BA. If not, you would have drill the t/blades or find another way to let more air in.
By using BA, blades are closed more, more of the T slot is available for transition. At the same point in throttle angle that the two systems merge, now with BA, the engine rpm will be slightly higher. That will create a little more depression & the main system would start earlier, idle system hang on longer. Might be enough to cover the lean spot.