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Automotive tire Tread Tire Automotive exhaust Synthetic rubber

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just got this 2004 yfz450 and I rode it for about 2-3 hours until I noticed what I believe to be oil leaking out of this small hole in the bottom right of the crankcase (2nd picture) it is on the right side of the ATV and everytime I start it up and give it a few revs it begins leaking again. Is this hole supposed to be plugged or do I have a bigger problem
 

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Oil pressure is way higher than coolant pressure so it would bypass a bad seal and go from oil side to coolant side, water pump seals and a new water pump shaft, make sure to check the lip goes on both to the correct sides and it should be good.
 
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