Four million and counting. That’s how many motorcycles have been manufactured at the Harley-Davidson plant in York County. Workers at the plant reached that milestone a few weeks ago. And that motorcycle has already found a new home in Summerville, South Carolina. Robert and Susan Shingler were brought to York County to get an up close look at the factory to see how the bikes are built. They checked out the assembly line and got a chance to chat with employees and shake hands.