I think stock jet is 82 or 85, I took out and put in People 50 that had maybe 72 main jet. 1st tried 95 main jet in Super 9, then when weather got hotter changed down to 92, all with stock airbox, but have Tecnigas pipe. Main jet that comes with it is too lean IMO. Mine was bogging mid range, which went away with 95 main jet. Ran very well with larger main jet, but CVT a little out of adjustment, would not shift down if got slowed down going up hill, but from start worked well.
With OEM muffler, 82 or 85 probably about right IOM, based upon how my People 50 2T runs. My 1st go to mod is Tecnigas pipe, really perks up the little guy, but becomes a tuning challenge.
Have Uni air pod, 105 main, 42 idle jet in it now with Tecnigas pipe. Loud, but runs like a champ, pulls up hills, into wind, good top speed, goes approx 1/2" past last line on speedo from time to time. I am running with traffic easily on 40 and 45 mph roads, and I know cagers are going faster than 40 and 45. Get noticed a lot, kids love it, get lots of waves, smiles. Cheers