Richard Pollock has an enviable problem: a full order book. Just last week, we featured a stunning Harley Sportster street tracker in his signature Mule Motorcycles style. It turns out that he churned out a second Sportster around the same time, and it's just as wild. The project was conceived when Mule's client brought him a very unique Harley-Davidson motorcycle—an early 'iron' XR750 flat tracker that had previously been owned by the late Allan Girdler. A lifelong racer, journalist, and f...