Watching both videos I notice he never approached anything near full throttle. Having owned a couple of Vipers I can tell you that motor puts out tremendous torque very low in the rev range. I can't imagine what a full throttle launch would do to that bike, other than obliterate the rear tire. If it were to hook it would likely launch itself out from under the rider. Dodge built something similar back when the Viper was relatively new. It had two skinny front tires and wasn't nearly as functional as the Millyard bike. Some outstanding fab work to shoehorn that motor into a real motorcycle.