Prior to me buying my engine, I wanted to personally talk to a human being. I called Raw-motors for about 3 days. This included a call about every hour starting 11 or so (central time zone), and ending about 5 or so. I wanted to ask some questions, and see which engine works best with my application. I couldn't get a hold of anyone.
Before you buy, make sure you talk to someone. Make sure you get their name, write it down, and make something like a relationship with that person. If something goes wrong, you don't want to rely on a website to solve your problem. You don't want to e-mail someone back and forth, without knowing whom it is. I ended up getting many things from Piston-bikes, they were not only very helpful, but everything came exactly as described. If it didn't, I'm confidant they would have corrected the discrepancy!!
Either way, hurry up and get your stuff, so you can ride. It feels great going out on a bicycle ride, and when you get bored, you just pop that clutch and let the bike do it's thing!!!