6v 90zz 19821 no spark - ignition coil? - help pls

[Gbsvrider]

Hello,
A relative newcomer to the forum since buying the above mentioned x registered machine and my first post.
Ive found this a great site with lots of helpful info and I have already reviewed all posts I can find to do with this topic.
I'm reasonably good with turning my hand to things but struggling a bit with electrics- so any help really appreciated.

Technical part of this post moved to the topic listed here - Capitano

viewtopic.php?f=23&t=35593

Cheers
Geoff