I just purchased a newly built motorized bicycle. It ran for about 10 minutes then died and will not start. I checked the fuel components and they were ok. when I checked the spark plug and spark plug cable I realized the cable had come loose from the CDI. So when I went to re tighten the cable on the boot side I noticed that the screw in the boot had come loose, and when I pulled on the cable the whole screw came out of the boot and was partially screwed into the cable. I purchased a new spark plug and boot. installed both and tried to start the bike but it would not turn over. When I checked for a spark there was none. I'm guessing it may be the CDI but have no experience with one. any suggestions?