Re: bike runs great for about 20 minutes then stalls.
You can clean the little vent hole. Carb cleaner and a toothpick for anything that might be large enough to warrant it.
If it's running fine for nearly 20 minutes, then your bigger issue things aren't really going to be a problem.
When you can restart it, is the bike still warm? Do you have to use choke when you restart?
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