Still having popping and backfiring issues
So I rode a little bit last year when I got the bike back together and just put up with some of the popping and backfiring. But when I was pulling things apart to replace the R/R I happened to notice that the rear carb boot didn't look right. Upon closer inspection it was definitely not on right or lined up right. So that explains the issues I had been having.
So I got the carbs off and back on with the boot lined up, and most of the backfiring seems to be gone, but I noticed something different. I honestly don't know if it's new or if I just never noticed it before. With the bike running, if I hold the throttle at around 3k or 4k rpm (doesn't seem to matter as long as it's constant) I get the occasional popping or backfiring. Both cylinders seem to do it, but the rear more often than the front.
I don't seem to have any vacuum leaks that I can find. Is this a Seafoam problem or should I start looking elsewhere. I just want to finally ride this bike just once without backfiring. Any ideas or help is appreciated.
*edit* I should note that it's a real low level popping and not real loud or noticeable.