How much poping is normal after ACV mod???

Is it normal to have some popping after ACV mod and if so, how much?

When I chop the throttle closed on about 6000-7000rpm it begins popping at about 4000-3500 down to idle. It's strong rare popping with blue flame out of the muffler.

I know I'm lean somewhere, but can I tell from the popping if it is idle or needle?

Please correct me, and explain if my whole understanding of this matter is wrong.

Thank you.


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