I will answer my self on the above question about orientation of Rocker arms pins.
First I have whach all videos on YouTube and on one I have spotted the correct orientation:
CSC RX3 Engine teardown by Sifu Carlos
Second I have asked CSC directly and after some time I have get answer:
"The flat spot faces up and the 2 little oil holes face down."
So I have asemble the bike and tested for 2 weeks already and can confirm that the above is correct
All the best for everyone
