Wow, that's been quite the odyssey!
I know NOTHING about the F650, other than they're well regarded and generally very reliable, only issue I know of is water pumps fail.
I think you're on the right track, but would be checking coils and general ignition wiring while you're waiting for carb bits. I've gone down the wrong rabbit hole myself more than once.
Plug caps are only the (second) last thing in the electrical chain... Does the spark look FAT and GOOD? How's the starting - is the battery good?
Mixture screw - improving until it can't go in any further - hmmm, suspicious! These might be very susceptible to pilot jetting changes. Put the damaged one back in, just not tight so you can be sure to get it back out easily. OR just put the one good one you have in.
Does one carb do low speed only and the other cuts in at higher speeds? (Like I said I know nothing of these things) IF that's the case make sure the low speed one is 100% as best you can. It should then run clean to half throttle-ish. If they both work together all the way, scrap that idea!
Fascinating issue, I look forward to hearing the result.
And nice to see someone else from the 'Wack here, welcome!
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Grant Johnson
Seek, and ye shall find.
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Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
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