Hi Conehead, how are you?
Thanks for the comment. The cam chain was what the dealer thought it was first time and it was the valves. It may be cam chain this time but it is very unlikely to me... Oil is supposed to have been changed on the 3rd of May (this month) because it was the bike's yearly service. Anyway, even if the oil wasn't changed, it would have 3500 miles by now.

Dealer asked to me to send the bike back and with no courtesy bike again...