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Can't say what will work the best on your scooter. Too many variables for anyone to give you a direct answer. Jetting is a trial and error type of deal.
In my case a 115 has worked out very well, with just an airbox delete..... replaced with a K&N cone filter......stock exhaust is still intact.
I would suggest you get an assortment pack of jets. With both intake and exhaust mods, you might start with a 120. Take the scoot up the street, if it runs fine at low throttle settings, but starts to bog/fall on it's face, at half throttle or higher, it's too rich, and main jet size will need to be reduced. Go down one size and try again. You'll want to go down in size, just enough to get rid of the bogging at high throttle settings.
My best "guess" for your case.....somewhere between 115, and 120.
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