can buy jets at almost any cycle shop the carbs are very common. Larger ones at Harley shop as they use 1 carb on 2 cylanders. I can't remember who has it for download but I'm sure one of the other guys here will chime in and let ya know. But one of the guys has a jetting calculator to download and I have tested it and it seems to work. I wish I had it when I was playing with jetting my scoot. A little pop on slow down is most often too small pilot jet or air mixture screw needs adjustment. If its the pilot jet chances are you need a larger main as well. Get the freak from newspeedmaster.com It makes a huge difference and comes with main jets too.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!