this was a 330 dollar mistake I made so I figured it was worth passing on. I copied what I posted on another mans request for help

ok not knowing which type of cdi box it was I will still throw out what your facing. first off don't ever use a battery charger on anything higher then trickle. or jump starting it with anything running. the spike in voltage taxes the cdi box. it will start as occasional spark misses then the more it runs, the worse it gets until you shut it off and get nothing. BTW a week ago I knew nothing of these systems, thats how much effort I stuck into it since then and retained. Come to find out the cdi boxes have a thermistor in them that is very touchy when it comes to voltage and can easily burn up. its the same part that burns up in amps for cars when taxed or heated.