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Not a fan of Ethanol in my gas.
Having a plethora of equipment at my one property it is a constant battle to carbs from corroding and the Ethanol from soaking up water in a High humidity climate.
I would think in certain high humidity climates and when these Scoots are waiting out a long winter Ethanol will wreek havoc on these little chinese carbs.
I have two friends in the Power equipment business. The one, two years ago in a seasonal business sold more than 128 new carbs. and twice that amount in carb kits. this past or current season is up to 400+ carbs and as many carb kits.
First Ethanol/Methanol is corrosive to Alumin. In my Kart racing days using the Yam KT100 on Methanol after the race I had a jug of gas/oil mix we hooked up to the carb (Walbro) to flush the system and the remaining Alky in the tank was discarded as it absorbed water like a sponge, Even fueling up in the High Humidity morning you could see the Alky drops turn to a Milky color absorbing moisture.
I have found that gas station's once the tank gets low and the Ethanol has separated from the gas your not getting E-10 the actual amount could be as high as E-25 or higher. The treatments I have seen on the market only list Petroleum Distillates, in this case a Aromatic and is only a solvent.
I have only recently fired up my new scoot, but I do have one gas station in town that sell's 90 engine octane No Ethanol gas. is pricy at $4.39 a gallon. But as my scoot sit's waiting my return from travel I find it cheaper in terms of my labor time and parts to fix the carb from the Ethanol attack.
The AMA has been fighting Washington on the E-15 coming out as it will attack older Cycles and especially Two Strokes.
Any other's with Ethanol prob's in power equipment and or Scoots?

Wondering if the crank throws are out of spec.
This will cause the vibration described.
I see max OE is .004, I find this excessive.
You should be under .002and ideally under .001on the truing stand then have Crank pin tack welded so it stays in place.
Unfortunately you have to remove the engine and split the cases to get the crank out and inspected.
Went thru a bunch of these with Old Sachs Sled motors, rev em and they went out of balance, we just trued and tacked them.
Hope this isn't your problem, not a easy fix

In addition, If you have any experience in the Automotive field, referring to Iron block Big Blocks or Small blocks you would know a tight piston to cylinder clearance is .003, usually .004-.005 much looser tolerances than Jap/Chinese bikes or even there lawn equipment.
I can set up a modern full blown Factory 250F sx/mx'r at .0018.
Same with a F-Extreme 600 or 1k Superbike. so in short the metrics have much tighter tolerances than the Auto market.
As expected I'm just finding sloppy manufacturing that can be corrected with very little$$$$. I think this would be a benefit to all.
My scoot as yours is also my hobby,toy and commuter.
Good Day!!

With all due respect these are metric machines. with Metric measurements and tolerances.
I'm not here to WOW peeps with my credentials, but they run deep.
I'm hear to learn what I dont know and share my 30+ years in the Motorsports Industry and provide technical data with what I have first hand experience in, both metric and inch.
agreed they are not sbc's, they are metric and I inspect and expect they should have correct metric tolerances.
I worked many years for a manufacture that supplied components to metric bikes, back in the day the oversizes were numbered and stamped in inches, .010, .020, .040 ect. if you do the conversion .020 does not equal .5mm it =.0197 and so on. These days a piston must fit a bore size with the correct clearance. again back in the day a tray of components could vary up to .002, now mfg can make 2,000 pieces that don't vary .0002
My resources also run deep and I get paid to do these types of builds with very little cost. Lucky me, and I have paid my dues along the way.
CVT sleeve $7.49 tighter tolerance and a 34.4 gram weight savings.
This is my toy and commuter and I'm excited for the upgrades.
The build is as much fun as the ride ;D