join the unOHfficials group on facebook. Tons of knowledge and helpful people.
Try working on that 15mph bike first is my advice. You learn a lot very quickly working on your own moped and you're going to need the knowledge if you have them to affordably keep them running.
You already have a 30mph bike, get the other to 30, then start trying to make one of them faster (if you want it to be).
For the sake of transparency, I took my wifes bike to river2strokes when she bought it cuz I was new to peds and phbg carbs. It wasn't expensive and I just wanted the thing to run reliably right away so we could ride, I don't regret it. I'd already got my stock puch going 35 just by asking questions and doing a lot of reading here.