ic igniter broken second time kz500 82

Hi

So i just bought z500 1982 and it had allready broken ic igniter only two cylinders working 1 and 2 ???  Then i order new and replace the old ic igniter and it started working perfecly about 200km until same happen again only cylinders 1 and 2 firing.

Question why my ic igniter "burns" ?

answers:
1. yes i know and plug wires are correct so each coil are working half or something.
2. coil ohms are 2.8 both and from secondary side i get 0.0 from all four?

sorry my english i read allmost all from forum but not quite find answer to my question. thank you