Homebrewer, that's a good user manual you post here!

I really thank you, but this engine came with many problems from factory, like I said, cracked fuel line from needle and carb, bad carb (Horizon replaced it), piston getting stocked.
I can say that pretty much I did try if not all of then, most of the techniques to tune this engine you discribed, double and triple checked all external things like fuel lines, tank, so on.
At this point, I'm considerin two things. The first and what I prefer is getting my money back and buy an OS engine. Second, if the retail store fix the engine, I'll probably have to accept it back, but will take time for me to trust on it.

The worst part is not being able to fly. I'm thinking about buying the OS engine even before getting this issue resolved. My flying adiction is killing me!

Nilo