we bought the above kit (came with black tipped plunger
the plunger kept sticking so used an original red tipped plunger, success, but, when fitted back on scoot it spewed out fuel within 5 secs
stripped again, placed float in cup of water & it floated.
compared dimensions of new black scootopia float to an original 5gr float. original is slightly smaller in height, scootopia pivot position is slightly higher
put original red tipped plunger with original float & hey presto, no leak from the over flow.