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In both cases I've only has decel popping.
Actually a perfectly tuned or lean bike with open pipes will pop on decel, I know that sounds counter intuitive.
For example, in the spring of 2003, I installed wide open Septres, rejetted, added a Unifilter and balanced the carbs, the America ran great, but all hell broke lose on decel. I thought well it's too rich, but on this site the advice was to turn out the AF screws, it worked, just a rumble on decel.
Not long after, I took the bike in for it's first scheduled maintenance check. I picked it up, started home and the at the first decel all hell broke lose again. I pulled over and turned the AF screws back out, I had already installed the thumb screw needles.
When I got home, I called the tech that had worked on my bike at Engles and ask what all he had done. He said he had installed some chrome fork covers, changed the oil and completely check out the bike. The tech said the carbs were in perfect balance when he checked them, but the bike was running a little rich off throttle when he hooked it up to the exhaust gas analyzer so he turned in the AF screws. 
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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