Hi Big bars; I mentioned side stand not center stand and 1/2 is what is recommended with the bike in the side stand.
Where are you getting that 1/2" information from?
T140 manuals and riders handbooks say 3/4" free movement with the machine "on its wheels" and the chain at its tightest
point, or, 1 3/4
" with the machine "on the stand" and the chain at its slackest