I cant find it anymore but I did see one build that was a highway cruiser motorcycle with the engine swapped for a 3 phase industrial generator with the appropriate electric motor in the back.
His original design wasn't even meant to run on a liquid fuel, but coal dust. That's the beauty of the diesel engine concept, aka compression ignition, it can basically run on anything that can burn and be forced through a nozzle at high enough pressures to get it into the cylinder.