[Schulisco]

Mothy,

good that you figured out and fixed the short on the WUR.
Indeed I wouldn't expect that this was the only culprit.

As said before - when you go on your next ride carry a proved working replacement coil and some tools with you, like additional spark plug for testing.

I'm a bit confused on your wording on the valves. I suppose you mean AAV (addidtional air valve) and the auxiliary valve (not WUR)?
See jimsbasementworkshop website for the correct part names to prevent misunderstandings:
https://jimsbasementworkshop.com/CIS/pages/comp_page.html Clicking the links opens the pictures as below:

AAR: It regulates indeed the additional air necessary to burn richer mixture controlled by the WUR.


AAV: Gives extra air to start the engine while cranking. After engine runs AAV gets closed due to vacuum on the output line and remains closed as long as the engine runs.


Thomas