oil leak from open port right above exhaust on cylinder

2004 Yamaha WR450

 

Does anyone know what is supposed to cover the port shown in my attached picture?

20160407_091921.jpg

That's where the decompression mechanism is supposed to be installed. You can order a head plug from eBay, or there is something at an auto parts store you can use. I don't recall what they're called. Will look and let you know.

Edit:

18mm freeze plug at auto parts store.

Edited by 0bigsilver6

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