Hi, need help.
Just finished full MC21 rebuild. New everything. All ancillaries connected. The bugger will not run. There is no spark from either plug. Pre-rebuild all the electrics were OK - it was just the crank that needed attention.
Checked the Coils=good, New Plugs New Battery, fully charged, TPS=Good, Kill Switch=good, Side stand Switch=good. Pick-up not checked yet (tomorrow night!). Main switch turns on the headlight/intruments and Powervalve motor is moving.
Frustrating night in the shed tonight with a multi-meter and a manual. None of electrics were touched (apart from removing pickups & stator for the rebuild).
Pulled the PGM3 tonight (god please, don't let it be the PGM). The G/W plug from the 16 pin black connector will not ground. Side-stand up or down. It's supposed to ground with the side-stand up, but won't. The side-stand light comes on and off like it should. I've got correct continuity from the side stand switch in up/down positions.
I feel like I might have found the issue, but want to rule out anything else that's obvious. It doesn't make sense to me that wiring could sit completely untouched for a couple of months and suddenly there's an issue.
Yes, the kill switch is in the RUN position! LOL
Any help or suggestions much appreciated. Feeling like I'm missing something really obvious (apart from an electrical engineering degree which might be helpful about now....)
Cheers, Simon.

I feel your pain. Mine stopped dead and i had to get home on the back of a lorry. I also have no spark and have been working through the wiring but no joy so far. Only thing i can add is that i have no oil light when the ignition is turned on. I did the test to check servo hi and lo and the oil light came back on but before i could check for a spark the light went out again !!! Good luck.

I've pretty much checked everything I can now and still no joy. The pick-up coils are showing equal Resistance (around 210 ohms) and I have continuity all the way back to the PGM connector. I cant check is the peak voltage from the pick-up coils as I font have the tool for that.
The only thing that is not checking out is the side stand wiring back to the PGM. The G/W wire is supposed to show continuity back to the PGM connector when the side stand is up. The switch itself checks out, as does the warning light. I should be able to start the bike with the side stand down and in neutral though, but no spark still. The G/W wire feels like a red-herring here as that circuit is only complete with the side stand up so surely I should still get a spark with the side-stand down and bike in neutral.
Feeling pretty sure I have a ignition side failure in the PGM.
Any other ideas for me to check?

Have you tried doing this with sidestand connector? I copied it from another thread, hopefully jonmac won't mind.

"Hi there 
does the bike have the stand switch in place ? if it has been removed the wires need bridging together in the block on the loom, If this is so give it a go, 
all the best, 
jonmac "

Well, this is a story with a happy ending! Eventually traced the issue to one of the pick up coils, the lower one to be exact. These were removed and then reinstalled as part of the rebuild. The insulation on the lower pickup was a little worn out and was grounding to the engine. This meant no spark on either plug.
To check:
-Disconnect 4-pin white plug under seat.
-Check each of the 4 pins to see if any of these ground to the frame
-Re-insulate as needed
Apparently this is a common thing, particularly with the lower coil which is more exposed to getting a bit of fuel etc on it from time to time.
I was a so happy when I found this as I'd starting searching for a new PGM!
Thanks to ****** for the advice here. You're a champion!

Congratulations, I'll put that at the top of the list to inspect. Hopefully i get it going before summer ends 😁
Cheers.