Float level is logically possible,.. but not likely...
The main jet, is clogged, or the slide is sticking...
To be the float,.. it would have to be at exactly the level that would allow idle but run out instantly upon opening the throttle...
When adjusting the float,... forget millimeters and micrometers,... just adjust it so that the float arm is basically horizontal when the valve closes...
(hold the carb horizontal, and blow in the fuel inlet,... raise the float with your finger and it should stop passing air at horizontal)...
Low tech... easy peasy...
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