2000 yamaha grizzly 600

Jordynlayne

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2000 yamaha grizzly 600.
Looking for info on what this hole may be, located just beneath the cylinder head. Below and to the right of the bolt in the picture. It appears to be leaking oil, the oil then rolls down the fins and drips onto the headers, burning off and smoking quite a bit. The hole doesnt seem to have any threads in it so im wondering why its there in the first place. Sorry ahead of time if this may be a stupid question. Im new to quads and am trying to expand my knowledge. Any and all feedback helps. Thanks in advance
 

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