I have recently acquired The Book of the Villiers Engine by Cyril Grange in it there is a diagram for a 12 volt wiring diagram for the above mentioned Villiers engines. I have never come across a 12 volt system on these engines other that the Siba Dynastart (which this is not). Would obviously be a major improvement over the standard 6 volt system. Can anyone through any further light on it, and to what these engines would have been fitted to. 