Compression in the oil resevoir

[Bushman_2]

I suspect my 2004 Dakkie has got some compression in the oil resevoir. When the bike idles and you open the oil cap to check the oil level it looks like the oils is boiling, she now also have excessive oil in the airbox.

What would the main reson for this be?

 

[Chrisl]

 

[Bushman_2]