+1 cdi/ignitor is another possibility:banghead. I have a guy down here in belleview that is parting out a 92 zx7 and everything is there as far as electrical is concerned. idk what he wants for the ignitor, coils, etc.92ninjas the coils interchange all the way from 89-03 so it's all good. I have a few spares if you need them. Yeah my CDI/Ignitor decided to get hot and drop two cylinders. So I swapped it out. Only choice I had was for a 92 zx600c. Works great just have to watch my RPM's as the 600 has a 14k limit and the 7's have a 12k limit.
Clean carbs wont fix carbs that aren't synced though. I bought coils for my bike thinking one of them went bad but my error was poor a/f ratio and my carbs being unsyncedHe's cleaned the shit out of the carbs right? Then look to other means.