Yea, I see what you mean Joe. It's probably something so simple that I didn't even bother to look at it. The last modification I did was to swap both the 15mm intake and carb for 14mm ones. Reason being that they were cheaply made by some weird company other than "bing", and both have something broken on them. Intake; had a crack next to one of the bolt holes and in the process of removing it, it broke off. Upper throttle body on the carb; had a small crack on one of the little metal pieces that holds the float's needle in place, then it broke off. So, I had to switch back to my original carb for now.
The problem is, I've tried a 72, 76, 78, and a 82 size bing jet in the 14mm bing carb already. But even with adjusting the air intake, it won't run right. If I restrict the air too much, it has horrible top end, and if I don't restrict it enough, then it usually dies. This was tried with every jet I own, but nothing seems to work right, like there's something else at fault. Whats irritating is that I'd taken apart the crankcase awhile back, but everything looked fine. I've tried every major trick that I can find/think of, but nothing seems to work. Even if there were like a dozen of the best moped people I know looking at my bike right now, even they might be stumped. I just don't know what to do. :(