Trying to build a 12v stator

I have a motorcycle project on the go and I would like to build my own 12v stator. If I make a single winding and rotate the rotor I can produce 6v, however, I would like to make 12v and I have repeatedly failed at doing this.

I thought that there needed to be a second winding over the first winding. I have tried this, winding both CW and CCW but I don't achieve any more than 6v.

I have tried linking the two windings up in series but no joy still.

Of course I may just have the connections in correct, if I have two windings on the same laminate and I joint the two windings together, I can then have three outgoing wires, two that are single and one that is double.

Any help will be very much appreciated.

Basically the more windings, the higher the voltage, so winding a single winding with twice the turns will double the voltage. If you're winding two separate windings, them wind them both the same way, and put them in series - essentially just a single winding.