Really can’t see enough of it to tell… I have a different belt system on mine…
Many of these have really low cost pulleys on the ends… either have to accept the best adjustment or modify them to your liking…
There are a lot of these out there and I wonder what issues you are having to diagnose it as uneven belt tension. These belts are timing belts and seem to last a long time…
Do you see odd output or?
