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Ok, I'll do that before the video tomarrow. I've never seen a vent run to a petcock either. But, there is no carbon canister or anything and EPA will not allow venting to atmosphere so I guess they had to do something with the vapor. and I'll bet if I took the petcock apart that vent shares the same half of the diaphragm as the vac line. this way the vapor just gets burned like the rest of the fuel.
But wouldn't that mean if I had a bad gas cap I would lose vacuum? and that my fuel tank is under vacuum when the engine is running? Seems counter productive for the fuel delivery.

Super cool! My 70lb labrador rides in my trunk all summer. I get "hey aren't you that guy with the dog on his scooter?" at least 3 times a week.

The link I provided show the tire being available in 130/70-12 and 120/70-12. These are the same sizes and tires used on the larger engine piaggio and vespas. I am currently running a 130/70-12 on the rear of my scoot in place of the 140/70 that came stock.
The only difference i noticed after the tire swap was a bit more takeoff as the 130 has a bit less overall tire diameter than the 140 therein reducing the engines perceived gear ratio. in theory this should lessen my top speed but in the case of my lil 50cc it actually helped. Since you have a 250 right? It may and or may not make a difference that is even noticeable. I had to try really hard to notice the difference on my scoot and it may still just be placebo effect. I have not noticed any other ill effects. I worked as a tire tech for 4 years back in rhode island and it is very common for tire sizes to be swapped around.
Besides that in normal riding you are only using ~50% of your tires width anyway. In the summer I really carve corners to the point that my pegs have hit the ground and flipped back up (Not many scoots have pegs but mine are "breakaway")and i still only use about 75% of my tires width.
Call a scoot shop or motorcycle shop and they will concur.

Honestly the way tire sizes work is: first number is tire width in millimeters. The /xx is the aspect ratio in percent of the first number (width), this translates into the height of the sidewall of the tire (a 100/60 tire has 60% of the sidewall height as the treads width=60mm height). the third number is the rim diameter and is sometimes accompanied by a speed rating letter.

Dont worry about specific size on the rear. a 130/60-70 and 120/60-70 will work just fine. for the front you should use stock size or you may throw off your speedo.

That is the "snubber" for the suspension to keep it from bottoming out. I noticed it too and am going to up my preload a bit on the rear shocks. Im taking off plastics and whatnot now for photos.

YT downgraded the video from 4k to 360p...sorry