Thanks for the compliment. The carb is the stock one that comes with the kit, I did get it breathing better with a SBP Chamber and perf. type air filter, and a Manic intake... I took the time to match the ports..... that with a 39 tooth sprocket and My 125 pounds she moves right along. I do wish I had gone with the other Schwinn model with the rear brake bosses, that's something Ill probably do this winter.