I am working on a 2000 300 4x4 Kawasaki Bayou. When i got it some of the wiring was cut and rewired. I got the wiring fix and I had no spark. I have another 300 4x2 bayou and I switch the brain boxes and the 4x4 started right up. It ran and started fine for a few days. Then i had no spark again. I put the brain box back on the 4x2 and it started right up. Then I switch coils and the brain box on the 4x4 and it started back up for a few day and lost spark again. I switch the brain box and coil back to the 4x2 and no spark. Now I am down two coil any ideals?