Hi Luc, yes you did put a chip no. on your reply, but the link seemed to be for a different chip. The 556 and 566 may be the same tho', I don't know.
Last year I decided I wanted to have variable advance in the ignition, because, that's just what I'm like
But after spending 2 weeks over Xmas trying to get the stupid engine to even fire at all I now think it's probably not necessary.
For our purposes I think a fixed 25 degrees, or whatever, before tdc will do for all revs.
So now I wished I hadn't bought the thing. That 2nd link of yours would have done fine. I think I'll build a couple of those anyway, as a backup for when I blow this one up again. If I can get something similar in the UK.
The Powerspark I've got is for a twin cylinder engine. It fires when the magnet passes the sensor, and again 180 degrees after, which is quite clever
So I put 2 magnets in the flywheel, to get 4 sparks per rev. Each of the 2 spark outputs is sent to it's own dizzy.The only slight downside is that the RH dizzy has to supply 2 of the plugs on the LH bank, and vice versa, so the spark plug wires aren't as neat as they could be, but I couldn't see a neater way. Apart from using individual coil packs. Maybe something for the future.
Cheers.