decel

So since the beginning of this season I have had this annoying backfire on decel. I figured that after the winter my carbs needed either some running time (haven't had much of that) or the shotgun/peashooter (haven't had much time for that either). Well, yesterday I finally got some down time...

when going hard then shutting down the throttle I get some decel popping and backfiring from the pipes? I have marks exhaust. morley kit stg 1 needles 2nd clip and 155 mukuni jets. do I need to richen the mains? I also am not overly impressed wiht the power of this set up. seems about the same...

Bike is running strong and sounds great with the HMF full exhaust. When it gets hot I get significant popping from both pipes when decelerating. A quick poke around suggests that this is not uncommon when you change exhausts, and that it results from too lean a mixture. Does that sound right...