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Have you tried new spark plugs? One fouled plug or bad spark plug cap can cause backfiring. Possibly dirty carbs ( a stuck float). Backfiring on deceleration can be caused by bad exhaust gaskets where the headers attach to the head (an air leak)
Check valve clearance, as vlaves wear the gap closes, most riders don't bother to adjust them till they have a problem like this.... By the way the valve may be part of the issue for backfiring while deccerating but Pipes cause this.
This is a sure sign your scoot is running too lean. Try to determine if its one carb or both. check adjustments fuel & air mixture first if not its a good posibility you might have to have your carbs balanced vacuum is shared by both and your coast down may be starving in one or the other.
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