I'm in the scrap metal business and I need a good reliable gasoline
cut-off machine (not chop saw). I had a stihl cut-off, it wasn't that
reliable. Can anyone tell me what is a good reliable brand of a
gasoline cut-off machine.

In the stihl chainsaw world, production was moved off shore and quality has
suffered. The best chainsaws are the older ones that are still in good
condition. I bet the same is true of your cutoff machine.

Karl