Kx250f '16 250, oil in valve housing

[Silvan]

Just did a top end rebuild on my kx250f, got it all back together, started up fine, but it wouldn't idle, after shutting it down and tearing the cover back off, the valve housing (not sure exactly what this area is called, but the top of the top end?) Was filled with oil, pooled in the whole area. Any idea why this would be? I've done many valve adjustments, and have never seen oil in there like that

 

The included picture is to show where the oil was at, but was taken after I had cleaned it.

Edited May 24, 2019 by Silvan
Added picture of the oil I didn't know I saved

[turbo dan]

 Looks great.  That means you have good oil pressure.  You want oil in the top end.