The only benefits of an electric motorcycle are that the energy cost is lower using a rechargeable battery, as power from the grid is cheaper than producing it using fossil fuel with a petrol engine due mainly to very high taxation, and lower carbon emmissions if the battery is charged using renewal energy.
Curently they are relatively heavy due to the weight of the battery, and have a very limited operating range between re-charges, which take many hours.
They are also for more expensive.
British Superbike School 