My wr450 04 spat out oil from somewhere

I was riding the roads yday in the pouring rain when i looked down and saw oill all over my exhaust. Dont know where it came from looks like my right rad but not sure as rain was heavy managed to van it home aint had a chance to look at it properly but has anyone come across this type of thing before?

Did you ever figure out what happened?  I'm pretty sure I have the same thing going on.  I've attached a picture - do you know what should be covering this open port?  Thanks, Dave20160407_091921.jpg


Yeah as jetfuel said it was decompression plug

ImageUploadedByThumper Talk1460323542.193213.jpg

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