Hi,
in the help file the following is stated:
Notes on &binvar binary variablesBinary variables have no size limit, and are limited only by memory, can only be accessed by commands /bread and /bwrite, so they can't be printed or assigned or edited,
and are automatically destroyed when a script finishes processing. When you run those commands seperatly then the $bvar won't return anything, because it can be seen as "different scripts"
Try this:
//bset -t &binvar 1 yo you yo | echo -s $bvar(&binvar,1-).text
Greets