That water leaking is due to a head gasket pressurizing the system. That's usually one of the first signs of trouble on the horizon. The seal is not the culprit. You can check the water pump seal by draining the oil. If you have any coolant in it then you may be lucky and just have a pump seal blown in which case it is a relatively easy fix. You will need to remove the side cover and the water pump impeller to get to the seal. You can use a seal puller to get the old one out and I would use a socket or something the same size as the OUTSIDE of the new seal. DO NOT let anything hit the inside of the seal or you will kill it.
I really hate to tell you this but most often it's a head gasket leaking that causes the water problem. Is it just a drop her and there or is it pretty obvious? That makes a huge difference. If the bike gets really hot you can over pressurize the system causing the seal to weep/leak, if it drips on a regular basis then the HG needs to be replaced.
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