My bike will not push start because back end is too light and tire will just drag. You can get started by sitting down on it and coasting down a slight decline. I've been able to push with my feet and go fast enough to start but not if going the slightest bit uphill.
If your wondering why I know it's because I wrecked my pedal arms with a grinder trying to get them to fit by the motor. Got a new bike now though.