classic motorcycle forum

The rectifier would be of the selenium type which would have a fair bit of internal resistance also lowering the DC output. Maybe Villiers accidentally invented the first regulator/rectifier. 🤔😁

These bikes were sold as cheapest-of-the-cheap commuter bikes, and if the battery went flat occasionally then just charge it up.
No-one expected anything else before the Honda C50 came along.

In the late 40s early 1950s, you could buy a basic little Villiers powered bike with direct AC lighting only.
Or, the upmarket version with 6v battery and charging system.
And the direct AC lighting was still available, selectable on the (special) Miller 4 pole headlamp switch.

I was somewhat bemused to see the battery charging system seemingly has no voltage control (?)
Or have I missed something ?   How did they get away with this ?
Does the half-wave rectified 6v output only constitute a trickle charge to the battery maybe  ?

Does the base model Villiers have the same number of lighting coils for the flywheel as the battery model ?

Jist curious, at this stage ...

Could the tanks for 1947 C10 and A7 be common  ?
Might need parts books to say for sure.

Perhaps a PO was going for that retro look......

Take a photo / measure the combustion chamber while you are at it. ?

That does look like a copy casting, its not clean enough to be a Villiers product. ?
Your combustion chamber possibly hasn't had the final machining to give the correct dimensions ?

The advent of ashless oils was a huge leap forward in oil technology, especially for 2 strokes.
I'm likewise unaware of these 'inertia rings', and thought I'd kept up with most such developments ...