My opinion: If youre belt has a tear, hole, rip or whatever, its probably best to replace it. Especially since youre half way there already. Youre gonna hate yourself if you have to push your bike home, then spend a day tearing it apart just to install something that coulda been done prior.
http://www.suzukipartshouse.com/oemparts/#/l/suz/50d32e6ff8700232d0b3d5da/198...I use ^this site^ to look up part numbers, then i just type em into ebay and scoop one there. Right now its showing parts for an 87, but you can probably find your way to the correct year.
P.s. if you have trouble finding a belt in your price range, i have one id be willing to part with. its got a few miles on it but still in better condition than that.