Thanks Troy.
I recently opened the regulator and cleaned up. There was a small piece of the rubber seal. After that, it run the same way. I will try to blow the little holes, and see if there some dirt. Is there a way to clean every hole, maybe a thin needle or something like that?

I have closed, for small amount each time, the regulator, to the point of a stable mid range and a great transition to WOT, but again, after a few minutes, the problem appear. I also opened and closed the low needle, to get a steady idle, but it always drip. If i close the regulator to stop the dripping, the engine dies at 1/3 throttle after flying a few minutes. I thought it was getting too hot, but the samething happens with the cowl off. The engine is in a venus, using a hatori muffler with almost all the head out.

I am using an apc 15x8 and wildcat ys2020 fuel. Maybe the plug is old, so there is a thing to change. It past the 9000 rpms 9400 if I remember correctly.

The fuel system and lines are more than checked and rechecked, not only for me.

Sorry to be this long, but I really want to make this engine run properly.