OK.
I opened the pump everything is in place. The tube between the pump and cam is fine. The check valve on the vent is ok.
I found something strange:
I disconnect the tube from the black check valve on the top of the head and connect an open tube just for air push pull test.
I try to check if the check valve is leaking. I found out that PULLING air is not possible and that the valve works fine in this direction.

BUT PUSHING air into the cylinder I find air leaking somewhere. I coud hear the air coming out from somewhere but could not find where from.
This was when both intek and outek valves were closed. To the best of my understanding there should be not air leak at this point.

I think removing the cylinder head and reassemble is a good suggestion. It is just pisses me off to do it for completely new motor. :-(
Very disappointing YS!

Amram