Oeh yeah, a blocked choke passageway in the bowl is a classic. Most people dont clean that one. You really need everything to be clean and in good working condition, before you can finetune the carb. Otherwise youre just fixing the symptoms, not the problems.
As with the fuel/co-screw: You just dont give it a setting. You need to adjust if for the strongest idle (not necessarily the highest) each time you play with the carb settings. So theres no saying "set it to 2,5 turn out, and you'll be fine"
In general, it needs to be somewhere between 1,5-2,5 turns out, but you have some wiggleroom in each direction.
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