Rick600FZ

Yes Cynic you are right cleaning all the connection and ground points

1 and 4 no spark 2 and 3 dose have spark. but if I put the plug that goes from 2 and 3 coil pack to 1 and 4 coil pack they spark

I did the swap and the other two works and the other two now is dead so both coil works. the yellow plug that goes to the first coil is dead and the white plug that goes to the other two works fine could it be the CDI going bad?

Hi there dose anyone know why on my 1986 Yamaha Fz 600 why am I only getting spark on two plug and the the other two I am not getting spark I try new spark plug check all fitting all looks good.