i think when you run lean the engine can run hotter. you probably need to either clean your carb or adjust it. the choke is just supposed to be to let the engine warm up and then it should be off.
Also, I read somewhere that a way to tell if air is getting in is to spray carb cleaner where you suspect a leak while it's running.
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D_Whitney
50cc Taotao VIP
139qmb, 18mm carb
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