So I'm not to familiar with combustion engines of any kind, and well I purchased an 80cc gas powered engine from ebay and a bike from walmart. I paid my friend to assemble the bike, I have owned it for about a month and about a week ago i was headed to work which is about 4 miles from my house. When I got about 100yds from my work when my bike stalled out and I haven't been able to get it started since then, I have checked the fuel line, the spark plug and have no idea how to diagnose it. Anyone have any ideas? I could really use the help!