Need HELP Please

I have a 2003 YZF 450. Somehow over the weekend I noticed that I had oil blowing out of my cylinder. So after a little looking around I noticed where it was coming from. Directly above the exhaust manifold there is a hole, it looks like a plug goes in there, (there are no threads) there also is a small ledge next to it that has a place for a bolt to go into. I checked on the Yamaha of Troy website for the diagram of the motor and couldnt find anything. I'm just wondering where I can get whatever goes in there to cover the hole. I'm also a little worried about any dirt that might of got in there.... As always your help is might appreicated

You need a decomp plug like the one sold in the TT store.

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