Maybe the float level in the carb is low? Or the fuel delivery is slow, not allowing the float bowl to stay at the proper level? Fuel filter or fuel pump?
Or it could be something in the ignition that starts failing when hot, ignition coil or cdi?
The pilot jet could be partially clogged or the fuel/air mixture screw too lean. For the first 10 minutes the auto bystarter adds extra fuel, but when it closes the pilot circuit is running lean?
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