fazer 600 2001 misfire

[ade the blade]

sticking float,blocked/stuck float valve  ? 

as above........to recap then, not leccy fault as carbs 3 and 4 have differing amounts of misfire ( both these plugs are `fired `by separate coils ) so chances of both faulty at same time are pretty slim. shit running when `fueled ` in normal manner but revs lovely when fuel is added bypassing carb ( vacuum nipple  :rolleyes )= internal carb issue.......and so we return to Red`s suggestion !! good luck. said it before, sit down with a cuppa ( and possibly a ciggy ) and just think it through. don`t start ripping things apart willy nilly. you know it`s a `fuelling` issue so keep solely in that area