I have a similar problem - I got a kit off of Bikeberry and assembled it just fine (bike store said it was ok), got some gas and motor oil in a 20:1 ratio, then started pedaling and it won't start the engine! Any ideas? The gas tank is leaky too... got to get the fixed :P

By the way, my kit came with the CDI and spark plug already on the engine, but it came with an extra spark plug and this huge bolt that I don't know what to do with.