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  The carb in your pic is a keihin PA series. The main jet as far as I can tell is a 99101-124 series. You could measure your jet, and google 99101-124 and you'll know.

  Does it start and run normally on the center stand? Have you tried revving it on the stand to see if the engine acted funky? Next would be pulling the cvt cover to see if something is hung up. You indicated your scoot had done a lot of miles with the restricted boss before you changed it. Was the variator worn in where the rollers had been stopping when it was restricted? Also the torque driver may have worn a notch in the slide grooves at it's previous max travel.

  First thing I noticed when going from the agility to super 8 was the mirrors are actually functional. Like the op, I too seen only my shoulders in the agility mirrors.

   That is the drain hose for the carb. It should just hang down towards the ground. There is a valve operated by opening a slotted screw which drains the bowl through that hose if you need to drain the carb for any reason.

 The sealed off hole. I was gonna have the weld shop tig a cover on it, but they were busy today.

   I see scooters every time I go out, and hear them drive by my house if the windows are open. Around here Kymco, Eton, Honda scooters are available between the two motorcycle shops we have. Most of the scooters I see are agility 50's.

     Results of marking the pulleys and running it.

   It appears the clutch pulley reaches it's maximum belt depth, and the variator reaches right at maximum travel about evenly.

  On stock exhaust, stock variator and clutch pulleys,  no rev limiter (it seems the stock exhaust is the rev limiter), upjet, it seems around 37 mph indicated is about it. Going any faster would take mods to facilitate higher engine rpm (pipe, bbk, carb, airbox). Or final drive gearing changes.

  If it had a clutch pulley that allowed the belt to travel to the bottom, the stock variator travel would only facilitate using around 70% of the clutch pulley range, the belt would have to be shortened to allow the stock variator to pull it to the bottom of the clutch pulley, and thus some penalty to the takeoff gearing.

  A larger variator with more effective travel would be ideal with a fully unrestricted clutch pulley.


  Just my interpretation of it, let me know what you think, and what results you have found.

  Many serious bikers to be found here http://advrider.com/forums/ 
I can spend hours reading through the ride reports.