1997 honda trx 300 2w

hi, i have a honda 300 trx lose fire i have replaced stators and pick up coil with ome new cdi and coil when i leave my neutral wire on the switch it want fire. i take it off and i can kick start it and it runs put wire on switch it kills it .i put new neutral switch in and still does the same.the cdi box is a after market one.as long is the neutral switch wire is not pluged in i can kick start and it runs great...i have been working on this for a long time ...i hope someone can help me thank you