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I've got a  new malossi 19mm carb installed.
Whenever I start the scooter up with the choke on, it idles around 1700-1900 rpms.
When I turn off the choke the scooter's rpm revs up to 5k and won't go back down.
So I just flip the choke back on and it idles back down.
Any idea what seems to be the problem?

https://scooterpartsco.com/malossi/malossi-master-part-list/maqlossi-21mm-carburetor-kit-for-50cc-scooters
https://scooterpartsco.com/malossi/malossi-master-part-list/malossi-carburetor-kit-phbg-as-21mm-kymco-genuine-50cc

What's the difference between these two?
I figure I can get one of these which is a reasonable price.

I've upgraded my variator with a Top Racing with 7.5g rollers. I'm still waiting on my tecnigas triops exhaust to come in.
What would be the next best upgrade be? Bigger carb? Open Pod filter?
Planning on eventually going 70cc bbk.

I've been looking at BBKs. Are they two malossi kits the same ?

http://www.racingplanetusa.com/cylinder-malossi-sport-with-head-70cc-kymco-horizontal-p-228-1.html?backcPathco=25&cPath=2_21356
https://scooterpartsco.com/kymco-super-8-parts/kymco-super-8-50-2-stroke/malossi-70cc-big-bore-kit-for-kymco-people-cobra-2t

Price difference is huge.

I recently picked up a '13 Super 8 50cc 2t.
The snorkel was taken out for the air box.
#84 jet and exhaust tube welded.
I was wondering what would be the best mods I can do.