Thanks for helping me! I already fixed it myself though.
One of the things that rattled was the valves, I apparently adjusted them to 0,010mm instead of the suggested (by the owners manual) 0,04mm lol. Fixed them and now the noise is gone
But boy was it a busy week, my plug broke off (was using a torque wrench, the thing just broke off..) so I had to remove everything to get it out, one of my clutch shoes broke in half, my oil drain plug was stuck and stripped beyond recognition. Got out a saw and some pliers and forced the thing out. Hehe.
She drives nicely, put in 6,5 gram rollers (stock) and cruising about with 8000RPM (a tad high) and usually at about 46mph speedo. Hope that I will get some good miles on her. 90 for jetting, drilled some holes in stock airbox and still got my Leovince exhaust.
Happy new year guys!