Yesterday my brother and I went riding on an old rail trai not to far from my house. We were about 30 miles down the trail and I was going about 50 and I heard a pop and the motor bogged and died. I replaced the plugs and it didnt start. So I checked if it had spark and it didnt. So I had a nice rest of the day getting towwed behind a viper until the rope broke

. Eventually someone let us use a tow rope and park in their yard until we could get the truck and trailer and load it up. So what do you think could be the problem? I think its either the coil or CDI. Thanks in advance.