1999 kit motor or 2001? What pilot and needle? I’m guessing this was at Buttonwillow?
This was actually at Summit Point, WV. I don’t know what pilot I was running as I have never swapped the pilot. I was under the impression that the pilot only affected the mixture at part throttle (I’m almost never part throttle at SPR). The popping only occurred at full throttle on the main straight. Needle was DGJ. I think 20:1 is the spec ratio for our club. The motor is a ’99 but I built it from an old dirt bike motor (completely rebuilt including the 6 speed). I did notice that I am missing the rubber boot that goes on top of the carburetor around the cable. Not sure how much that would affect it.