04 Yz450f Water pump help

I taken of the water pump casing and now im to the impeller shaft. Now im having trouble trying to take off the Impeller shaft. Is there an easier way to take it off or do I have to take off the the whole engine casing off the bike to get into it?

You're lucky that you didn't break the shaft doing it that way. The engine case cover is supposed to be removed and a wrench used to hold the shaft as you unscrew the impeller. The shaft can only be removed from the inside, so yes, you have to take the case off for that.

is the impeller shaft damaged or scored?

hope not, if it is you may have some more issues

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