I want to build an electric motorcycle ( more of an electric bike, actually), but i don't want to use a conversion kit.
I want to take out the pedals and put a motor there (either 12v DC or 220v AC). My problem is how to transfer the power from the engine to the rear wheel: Do I need some sort of gearbox? Let's say I would use a 0.7kw, 3000rpm 220v AC motor: How do I connect the spinning rod of the motor to a chain or belt (it doesn't necessarily have to be chain driven€
Is this a bad idea? Can the motor drive the wheel directly? The whole thing (including the rider) would weigh less than 150kg. 0.7kw is enough for the speed I desire. (I am interested in building a dirt bike actually...)
Excuse my English, I am not a native speaker.