Hi everyone! I need some help with Brake in my engine.

I have a Vega .12 3 port. I believe it is Italian made. In the manual says that I should use 10 to 15% percent fuel, and I am using 10%. Also it says that for brake in, I should open the main neddle 1.5 turns, and it doesnt say anything about the low speed needle. The carburator come with the low speed needle closed. The thing is that I tried to start the engine as the manual says, but engine doesn't start. I tried to open more both needles, and the engine starts, but stalls when I accelerate. When I open the main needle 5 or 6 turns, the engine seems to respond, but it stalls after one minute or less when I accelerate. It seems that there is a lot of smoke from the exhaust, but I dont see oil coming out. I dont know what to do! Please, help!

Thank you very much