Well as per the wiring schematic green wire from cdi goes to on off switch in which other side of on off switch is black and goes to ground. When the switch is open you will have no spark, when switch is closed a ground is completed which allows current to flow. In all my years in automotive as well as off-road be it buggies, atv's or scooters solid green is ground. If as you say that green wire which goes to the on off switch was hot, then when the switch is made you would have a direct short since the other side of the switch goes to ground and wires would surely burn up.
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