hello, i've been lurking in these forums a while, and love it! Great info on here. I decided to purchase one of the "80" CC kits from China. Im not very mechanical so I had a friend do the install for me. He got everything done, and the bike was running great at his place. I took it home and earlier this evening went for a ride. About a mile from home I was going slow (about 15mph) and the engine just died. I thought maybe I was out of gas so I peddled home. I tried to start a few times but it would not. As i said im not much of a mechanic but my friend left for a few days. I had a look at all connections and they seem ok. I pulled the plug, tried to look for spark, but could not see any. (It was hard to check as I had to kick the bike to try and turn it. Any suggestions on what else I can check? 
