They look real nice, weigh in at 242 lbs (that's a tiny bit more than a typical 450 4-stroke dirtbike or that fat guy you always see at McDonald's) but they only put out 11 hp and 6.63 ft/lbs of torque.
That's 22 lbs/hp and 36.5 lbs/ft-lb. of torque. Not including rider weight.
By comparison a typical sports sedan putting out 200 HP and weighing 3300 lbs would be at 16.5 lbs/hp.
Toss a 450cc (40-60 hp)dirtbike motor or even a 250cc (30-40 hp)dirtbike motor in and then their in business.