Znen ZN250T-D Running Rough + Headlights

[blackout]

Hi Scoot Dawgs,
I've been painstakingly researching, attempting to fix this scooter for about a year now, and at one point almost left it beside a dumpster. I think it's time I ask for help. All help is much appreciated.

I have a Znen ZN250T-D, and the initial issue was a broken belt. Afterwards I replaced the melted rollers, destroyed variation disk fan, shredded belt, and terrible black coolant that came with the scooter. But unfortunately the scooter seems to be running rough.

TLDR:
1. If you watch this video you will notice a constant squeaking coming from the CVT transmission, and the RPMs seem to fluctuate as the bike feels like it's struggling to stay at a steady idle.
2. The scooter does not die during idle.
3. Does not feel like it's running rough while riding or at higher RPMs.

Anybody have any idea what the issue might be?





PS: Also the headlights do not work anymore. The low-lights work, but not the switchable brights. This happened when I was replacing the coolant. I might have spilled a bit of the coolant on a connection, and I am unsure how to diagnose the issue.