RE: engine shutting down on take off
I agree with the members that advise a lean mix.
As I see it, when you open the throttle at full, not enough fuel flows into the Venturi of the carb, and the excess of air just suffocates the flame.
At low and medium rpm's, an extra rich adjustment of the idle helps compensate a lean high.
Check for any restriction inside the needle valve, as well as inside the nipple of the muffler from where the exhaust pressure feeds the tank.