[RickR]

The brushes get very hot and arc like a welder so I changed the brushes and it still is happening ,is the saw "cooked" or can it be repaired?

 

[JonM]

It's what you use to make a living...buy another, they aren't that expensive.

 

[willworkforbeer]

Bad armature (circular contacts brushs rest on) Possibly you could sand it down smooth, likely one or more or damaged beyond repair. Could be fixed but probably not worth it.

 

[kirbymurphy]

Bad armature (circular contacts brushs rest on) Possibly you could sand it down smooth, likely one or more or damaged beyond repair. Could be fixed but probably not worth it.

Sand it with a really fine grit.
Make sure the brushes are in properly. Some have an arc ground into them so it makes full contact with the round armature.
Also, did the brushes come with new springs? Most do but not all have them.