iv never don it on a cat, but on my yamaha i had to
open the chain case,and remove the gears and chain,
drop the track and rear suspention out
then unbolt the housing that holds the bearing,
then u should be able to slide the drive cog assembly out toward the chain case and then pull it the rest of the way out and the bearing should be on the end of the drive cog shaft. atleast thats how it was on my exciter
i think its pressed on, put the outside of the bearing in a vice, and tap out the shaft with a mallet, use a piece of pipe about the same size as the shaft so you dont dammage it,also spray it down with some penitrating oil to get any corrosion off. if that doesnt work, than have someone use a press and press it out
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