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Research tells me that this is the carb vent, how come when i put my finger over it, the scooter acts as if its fine? I ran a hose to it and plugged it and it wont stay running, im confused.

Is my fuel filter supposed to be full? Its maybe 40% full at all times and located AFTER my petcock (gravity fed). Found a scooter parts store literally 1 mile away from my home! so I will replace petcock for 12$. Just wondering if my petcock isnt giving the carb enough fuel. Thanks

it speeds up when i back off the throttle a bit. This is all starting to make sense. Maybe a week ago, i put the scoot on the center stand and attempted to fool with the air fuel screw, however i wasnt knowledgable of doing a quarter turn and letting the engine catch up. i only turned one direction and that was clockwise and it was also while i was holding the throttle around the area where it bogs out. It did not change performance much at all upon turning clockwise. As a side note, when the scooter is under no load on the center stand and held at wot, it acts as if the rev limiter is set at 6.5k rpms bouncing at that rpm steadily.

Story behind the scooter:
i recently purchased a 2009 velocity 150cc gy6 scooter for 300$!...yes 300$!..the scooter is in pretty great condition for 4000 miles. I found it in my neighborhood..a middle-aged woman bought it for her nephew, he rode it, parked it a few months ago since he shipped off to navy.
Now then, upon pushing the scooter to my home (two streets away, battery was dead), i charged the battery, put it on the center stand and cranked the starter button. Behold, it started right up. After letting it run for a few minutes, I decided Id see what the scooter was made of, as Ive had 2 of these style 150cc gy6 scooters. Now the scooter has good throttle response and pulls hard at wide open throttle until about 30-40mph at which time it bogs and jerks around until i pull back on the throttle and it smoothes out. The scooter acts as if it has a speed governor. My initial thought was a valve adjustment, upon completing that task, the results were the same with a little better throttle response. My 2nd thought was a vaccuum leak, so i replaced all the lines with new hoses EXCEPT the bigger hoses for the PAIR canisters. (havent got to that yet). Upon completing all the fuel/vaccuum hoses and a new filter, same result, still bogging around 6k rpms. I then decided to pull the fuel bowl off of the carburetor and inspect/ clean. Everything was fine (float/ jets cleaned) Once again, no results. I also replaced the cdi with a brand new stock one.
Im at a loss, i know this scooter has good power and can be fast i just cant figure out what is making it bog out and making me drive around town at this annoying slow speed. i also pulled the fuse for the alarm on the off chance that that had something to do with the problem, nothing.
I know this is long to read but I wanted to give as much info as possible for help.
Any and all help is appreciated. Thanks

Yessir, Going to paint it black w/ black wheels. Ordered rollers, a clutch and drum, and rear gears for more top end. I want it to keep up with my 150!

ALLEYOOP YOU ARE THE MAN. the tapered needle came off of the c-clip in the diaphgram. thank you good sir. I actually came back inside and hopped online to thank you just as I saw the needle sitting down in the carb while the diaphgram was out. I will now return to the garage and see if i cant put it back together. thanks once again