Went lean...

fishermen67 - In that one picture you can see how it was hanging over the primary side. Somewhat blocking the primaries. Like a choke. It had been in that position for a long time, due to me removing the entire assembly, and not looking at that piece inside. So I had tuned for that amount of air blockage. Since I had tuned for it, it wasn't running rich.

Upon "the event," talking with my new friend, he wanted to see the AVS2, I pulled the assembly off. At that point, while distracted talking to him, the air filter assembly didn't come off as one piece due to my distraction, and I wound up with the upper, lower and filter separated. I then noticed it wasn't straight sitting in the lower. At that event, I put them back on the carb in 3 pieces and "fixed" that vent back to where it is supposed to be. Never thinking or noticing (at that time) that it had been so far out of position, it had been hanging over the primary. So when I put it all back together correctly, blam, extra air flow (not tuned for) due to not blocking the primary, and the AFR gauge noticed.

I just drove it out to lunch. The primary side tuned is now good. Feels like EFI when at speed. It idles good, meh ... better, chokes correctly. It's very nice. I'll tune the WOT later. I've not been happy with the AVS2 since I put it on. And this previously unrealized blockage was the culprit. It did drive ok because I had tuned for the blockage previously not knowing that it existed. But I always felt something was off. Now I get to have fun fine-tuning it to perfection. I'll of course always check this vent. I'm going to replace the PCV valve and breather components due to all this.