An oversize needle orifice or blunt needle taper would interfere with fine adjustment and act more like an on/off valve. The coarse needle threads don’t help, either.
The carb/mixer on my engine will allow it to run within about 120* of needle twist with 35:1 Coleman's and Seafoam.
You can get a complete ignition system with spare plug from Banggood for $40 and postage.
https://tinyurl.com/tyazy9z
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