Last night I finished assembling my engine on my bike. It says its an 80cc engine. Anyways, last night I got it started with quite a bit of pedaling, 10-15 minutes. Once I adjusted the choke properly it ran just fine. I then realized that the petcock valve was leaking so I dumped all the gas out of the tank and line. I resolved that problem with plumbers teflon tape this morning, but now the engine won't fire. It growls and growls like it wants to stay on but it won't. As soon as I stop pedaling or pull the clutch in it stops growling and won't stay on. All my wires are tight and I fiddled with the choke too. I can see fuel running into the carb and being used. Any suggestions for essentially a first time start up...perhaps any after market products that would help start the engine easier?