ok the bubbles in my engine are from low, half and even full throttle!!!the bubbles are a lot, not one, two or three!
the engine is inverted and is mounted on a AW EDGE 540 60/90!

I run the engine with the cowl!!! still with the problem!
I email YS and they told that the fuel im using could work with this engine, but the performance will not be the best!
I checked the tank is good and also replaced the fuel lines and still is bad!


One think that I noticed is that from the tank to the inlet there are no bubbles, but from the Diafraghm to the carburetor the bubbles came, and a lot!
Any other advice,
Alex MBA