I get carb icing on the big twins from Jan to April although
have never experienced the problem on the 883 however it is fitted with an SE air cleaner
fitting of a high flow air cleaner and re jetting to suit does reduce the effect of the carb icing on the big twins
fitting a mikuni hsr 42 further reduced the problems have both big twins now at the stage that i get a lot of backfiring and rough running untill warmed fully up then they become usable but tend to keep the speed down to around 50 in the colder temps (getting old) perhaps the bikes will be ok faster but ill just get colder quicker
Brian