Thanks for the replies.
Not sure why this thread does not appear on the FourTrax main page. Had to search to find it.
I havenít found a part number but as suggested I may measure bearing and try to find a replacement.
The commutator is in bad shape. It was caused by the brushes. However, the brush sets I have used were HONDA parts purchased from local dealer. I, too, am surprised at how bad they have been.