hmmm, didn't think to look on james's spread sheet, maybe my info is incorrect. i based it on my experience with going from an nozh to the nozg. i had my bike ported, & it had a flat spot in the power right where it transitioned from the needle to the main. asked an expert, he said to go to the nozg, it was richer there. did that, problem solved. so i presumed from that that the e would be richer at the top than than the f. sorry if i am incorrect.