However, there is something odd going on. It shows two spark plugs, and to the very best of my knowledge, all the ones imported into my country (UK) at least had only one spark plug. I also think they always had a sidestand switch.
I've owned all three generations of the Bullet (iron barrel, AVL, UCE) and they definitely all had only one plug, and a sidestand switch.
Clearly there are minor differences, presumably depending on which country they are being sold in.
There is certainly something going on. We have three members weighing in saying they CAN kick start THEIR machines with the side stand down, (two of those were '11 builds, the other unknown). And, we have a couple more saying they disconnected or bypassed their sidestand switch. And we have a couple members saying nobody will be able to kickstart any UCE with the sidestand down.
I should probably dig through the boxes of parts that contain my '99 Bullet, and my '12 C5 to verify, before I pile on more speculation, but I think the '99 does NOT have one, and the '12 does. However, it's not so much the presence of a switch that determines whether the bike can be started with the stand down or not, it's HOW the switch is wired.
An electrical design that I have seen perhaps more often than interrupting power to the ignition is to disrupt the primary circuit of the starting relay, generally on the ground side. Of course, that's usually seen on electric start only machines, and contrived to be functionally in series with the neutral switch. Another early design just turned on a warning light. Folks whose machines are fitted ONLY with side stands, which seems to include most of them nowadays, might well want the machine to be able to start and run on the side stand.
It would be nice if RE was more careful about publishing accurate wiring schematics for every variant, but that ship has sailed. Wading through the wiring diagrams published in my '02 edition P. Snidal Bullet Service Manual, I'm not seeing sidestand switches on ANY of the SIX diagrams. Indeed, I haven't seen something labeled as, or even looking possibly like, a sidestand switch, showing up on any Bullet / Classic 500 schematic dated earlier than 2014 or so, at which point they are shown as triggering a Sidestand Relay daisy-chained to the Power Relay's primary, as I mentioned in my earlier post. Of course it could be present and undocumented, or I could be missing it on every drawing.
I wonder, HOW was the switch wired on your various IB, AVL and UCE machines?