The way I would design an electric motorcycle would be to use a single swing arm rear end, with the electric motor and braking system built into the swing arm. So, all the engine/transmission would be at the rear wheel, which would free up the rest of the bike for the Lithium batteries and support electronics. Anti-Gravity Batteries makes a 12V, and I think even a 24V Lithium Battery rated at over 720Amps. It weights about 5 pounds for each Battery. Put about 12 of those 24V batteries on the bike and I think 150 miles is very possible. The Bike would probably weight around 300 pounds.

Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)