Stink Racing

I have had the engine running on an RGV250K CDI module but it had a miss which I suspect is the timing advance built into the CDI.
As the RD400 didn't have an advance curve I decided to try the simplest CDI I could find - Jaycars kit KC5466. No problem assembling the CDI and checking it's all OK but it requires an input of 350VAC...
I measured the output of the stator on one wire and got between 8VAC and 12VAC. A friend of mine tried a trick of putting one wire to earth and got 20VAC on the output. This is somewhat short of the 200-350VAC Jaycar says is 'normal'.
A quick call to RDJase (cheers mate) and he gets 48VAC on his TZR. OK Jaycar; how is 350VAC 'normal' and how do I get it?
Or does anyone know of a simple 12VDC input CDI (like the RGV one is) with a linear low advance curve?
I'm looking at the TZR250 1KT unit now and hoping I can figure that one out as I believe the total advance is only 5°.

Nothing worthwhile is ever easy - but that doesn't explain why this is so hard.