The water pump on your bike comes apart in a similar fashion as other 250cc singles:
You need to remove the pump cover and the right-hand side engine cover and remove a circlip from the impeller shaft on the inside, and then pull the shaft out.
The impeller and shaft are one piece.
You'll need to replace the impeller shaft, the seal for the shaft, your cracked pump cover, and the gaskets.
I'd replace the circlip, too.
It's not that big of a job, just daunting if you've never done it before.
Don't know of any aftermarket parts for the job, but it doesn't matter because a rock can crack those just as well. :)
A skid plate if you don't already have one will offer some coverage, but even that is no 100% sure bet.
Somewhere around these forums, there's a download for the Service Manual. :)
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