[QUOTE=särpet;12182693...
That safety needle is not good,if it is screwed to the engine it vibrates and fuel line get air bubbles,if it is out of engine it works, but if try adjust it air bubbles will come again...
.[/QUOTE]

I am not sure with the carb you have, but I have several times taken a screw out of the carb side and screwed the needle valve assembly directly in to the carb body, taking the remote gadget out of the system.. No more bubbles. I learned long ago not to get my fingers in the prop. Good luck.