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An exhaust "babble" is not necessarily decel pop. I had a early pair of SE slip ons that made a babbling sound on decel and the 2 sounds are totally different.
Looking at the plug pics did you clean the right plug in the pic? If not the left plug is just a leeeetle bit lean.
Nothing to worry about in my opinion.
Not cleaned. As stated in post 41, one is front and other rear cylinder and your are probably right about left is lean. (came out of rear) Your probably right about babble as just exhaust tone, I have to really drop throttle hard to get it to after burn pop. (I am running stock exhaust)
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