i have a blaster that i just got bored out to 1 size over stock. i had it running for bout 15 mins, then it would rev high, almost die, go high again and die. i let it sit over night to work on it in the morning. in the morning i couldn't get it to start. i check over things pulled the spark plug to test it and found out there is no spark. i check all the wires, every things getting power, so the only thing i could come up with was the CDI unit or there is something wrong behind the flywheel. have any suggestions on what it is? and how could i test the CDI unit to see if its working before i buy a new one?