my son is looking at 01 summitX 800, piston updates have not been done, will skidoo still do them? also this has a 144x1.25 track and 41 inch stance. did the Xs come like that or has this bin widened? nd did they come with 1.25 track?

I believe that machine came with a 2" bomb track. I would never take a Summit with a 1.25 track. Go with a 144 2" at least. If possible go with the 151. Mine is a Summit 800 144. Maybe someone changed it for trail riding.