seems like all cats had dd bearing problems! change them out, i was just asking the same questions last week. bdx has bearings and seals which im assuming are better than factory for around a hundy. im gonna get them for mine, back bearing on the gear cluster is done, seal is popped and cage is pooping parts out!
I rode with guy that had one they can really move i was riding 800mxz
i had to hit the throttle hard in the powder to stay with him 3 times that machine rolled on its side even in silly little rut they are so heavy he was saying it weighed 1100 lbs so do not get it stuck