Regulator/rectifier live wire cut by thieves?(Keeway rkv125)

[Blakstone]

My motorcycle was stolen for a joyride and then dumped and recovered by police. It managed to start at the scene and but it later died as I was trying to get it back home. I'm quite inexperienced with repairing bikes but have some understanding of the field (Mechanical engineering student). It felt as though the spark plug had stopped working. Fast forward- I discovered they had cut the live wire (red) leading to the regulator. So, naturally, I thought that was the issue and soldered the broken wire back up. No luck, when I attempted to start the engine, the starter motor would turn and it seemed the rest of the starter systems did, but no spark. I tried with a brand new spark plug, still nothing.

Fuses are all in tact as well, battery checks to 12v.

Does anyone have an explanation for the cutting of power to regulator, and why I was able to start the bike in the first place (on crime scene) but later died?
Does the regulator have anything to do with the staring sequence?

I was initially about to check fuel pump, carb and all, but if there is no spark, then surely fixing that would resolve the issue.
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[Easy-X]

If it was stolen there's no surprise they'd messed with the wiring although I have no idea why they'd cut any regulator wires...

I would suspect they've also messed with the ignition wiring e.g. two wires twisted together and on the way home the two have become unravelled.

Either that or you're just unlucky and something like the kickstand switch (or cable) has given out; totally coincidentally.
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Easy-X]

Looking at the circuit diagram for my Superlight (which is probably nigh on identical your Keeway - the Chinese are nothing if not unimaginative!) I would imagine they were trying to cut the power to a possible immobiliser (although that wouldn't actually work.) The upshot being the regulator won't charge the battery any more which you wouldn't notice so quickly in the summer as the biggest drain would be the headlamp.
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Blakstone]

[Kawasaki Jimbo]

[Easy-X]

The kickstand switch "turns on" when the kickstand is up. To bypass it you need to create a connector to bridge the two contacts. I made one to keep in my tool roll in case mine ever goes again.

Other things that stop the bike that I can think of: clutch, neutral and kill switches. (i.e. if in gear it won't start unless you grab the clutch. Kill switch... not often they go faulty but should be easy to bypass.)
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter