I tried the new CDI. No difference. If anyone needs one....

I've removed all the connectors and cleaned with computer solvent cleaner

I check the igniton pickups. The lower pickup cabling has a split in the cover and the wire is showing. I've put some insulation tape over it for the moment but might see if I can source a complete set off pickups and cabling

The pickups are magnetised and collecting fragments of cable. I removed all the bits.

Still not firing cleanly. Tried with and without restriction cable. Currently disconnected