I thought the modern ones had transmissions like a car.....N, R, and D, with drive being a two speed automatic. Just drive it like a scooter....roll on the gas and go.
Considering the ridiculous HP/torque numbers, they're not all that fast. Too heavy and can't put the power to the ground. A little 600 crotch rocket will smoke one with 1/4 the power and probably 1/10th the torque.
It's a flight of fancy, the "shock value" of a big block V8 stuffed into two wheels and little more. Same idea of people putting those enormous Packard tank engines in cars that were like 25 or 30L displacement, then getting literally gallons to the mile. Got lots of cool points, but little else.