When you say doesn't work, what do you mean? is the seal leaking?

The water pump shaft is driven off the crank shaft. THe impeller shaft also drives the oil pump. So if your impeller shaft isn't spinning, I am thinking you have a bigger issue. If the seals are gone, then you can replace those pretty quickly.

Either way, if you are having an issue with your water pump you should check it out before riding your bike again.
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Charles Gallant