If it sputters and dies - most likely a fuel problem - something as simple as cleaning your fuel cap vent to prevent vapor lock or (increased pressure as it hears up), up to something more complicated like re-building the carb (heats up, expands and fails to meter air/fuel mixture).
If it's a sudden stop - check the coil - as it heats up and gets bigger it will eventually short.
Two pretty common things to try. Coil and Cap - no money required to check those two out.
Check you tube - i'm sure there is some good info on there
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