You can make lots of things fit that were not intended. I had a 150/70-17 Shinko 705 mounted on my Buell Ulysses in place of a 180/55-17. It looked funny, but rode and handled pretty good. So I would think that you could replace a 150 with a 140 w/o any issues.
"I refuse to tiptoe through life only to arrive safely at death"
'13 Tiger 800XC, '14 Street Triple, '00 KLR 650(current project), and a 2010 Honda NT700V for the wife.