timing or ignition?

my 04 bonny came with loud free flow aftermarket pipes.. the right pipe pops while cruising with no throttle, the shop said the carbs were balanced but replaced the plug on that side... with no availe the pipe still goes pop pop... any suggestions?
 

Kirkus51

Hooligan
My 07 (TORS) does have a tendency to "pop" thru the pipes too. However it runs good so I don't worry about it. If the bike runs good, it might just be that the carbs need re-jetting and not balancing.
 
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