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Is this pin hole supposed to be here?

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Just bought a KLX 450 and discovered a pin hole is located underneath the water pump maybe on the bottom front/ right side of the crank case. There is a little bit of oil dripping out. But it isn't constant. Anybody know what happened or what this is? Thanks.

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I ran the bike for about an hour today. The oil in the site window is dark brown/black and the little bit of oil dripping looks like normal used oil, not too black pretty thick yet. The pump area is making some noise now, so it makes sense that it is the pump bearing and seal. So that hole is an escape route or something? Thank you very much for your help!

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