No gearbox either, but yes, how do you pull away at the lights?
Open the decompression valve - a sort of tap on the top of the cylinder head, when the lights go green you pedal away as you would with an ordinary pushbike, until you reach a reasonable speed and then you close the tap. At this point either the engine starts or you grind to a halt.
the rest of the pictures? here are the links
and work - bee ready for mundi