Eh... I was outside a seven eleven and realized the noise was coming from just behind the radiator, I later confirmed my doubt looking at those engine valve ports that have caps, seeing one was missing, fortunately there remained some part of the cap, so I had the chance to improvise a blocking thing, I used aluminum that I got from a soda can, its obviously is not completely sealed, but works just ok, I was limited to certain materials since there got incredible melting hot hehe. Will see later how to get some caps, the noise is still there, much more dimized, only a sealed cap will obviously work perfect.