nc23 annoying weak spark issue

[pptom]

So, after a thorough winter freshen up, i finally got the final part (tyres) on today. Hit the starter and it fired up straight away and ran fine, turned it off after about a minute, i've never had any trouble with it running, its been started and ran quite a few times recently - carbs are rebuilt and balanced, new fuel and air filters.
Dropped it off of the paddock stands and fitted the headlight fairing, decided to start it again 15 mins later but it just span over with maybe the occasional single cough and the very odd backfire.
So far i've checked:
Its not flooded
Pulled all of the plugs and checked individually, all of them have a very weak spark tried a replacement plug with the same or worse spark.
Run switch looks in fine shape
Neutral switch gives the proper readings with a voltmeter
All wiring looks fine
Fuel pump works
Hooked up my spare car battery with the same starting results (brand new bike battery was getting weak by this point)
Checked the diode and pulse generator as per the haynes manual and they're fine.

I'm hoping its something simple like a pulled wire, but i just can't find anything
Anyone have any ideas please?
Given up for tonight and left it on charge.

[pptom]

Thought i'd update as is now fixed.
I basically checked every electrical device as per haynes, then read this morning about burning the plug ends, so, in desperation gave it a try.
Unfortunately i broke the cardinal sin of only trying one thing at a time and also had a fiddle of the multi plug off of the fuse box, one of the blades seemed a little out of line.
Anyway, it fired! Picked up some replacement iridium plugs today and finally fitted the fairings.
Just been for a cheeky little ride and i'm grinning ear to ear. This is the first time i've ridden one of these for about 18 years, i always remembered the revs, but man, it sounds good. After a few years of 8k max ducati's, some twins and singles it seems to rev forever!

[Davez29]

Excellent, good that you sorted it. These bikes can be quite tiresome when something goes wrong as the inevitable pull everything to bits before you can check something even simple, does put me off especially n this weather as it means dragging the bike outside. I have to check my plugs but I just keep putting it off. Now I'm off work it looks like its going to snow, so its put back again!