I'm really not a mechanic so please go easy on me! I own a kawasaki gt550 and the other day as I was riding home, the bike all of the sudden started to run on only two cylinders. The coils on my bike run to cylinders 1/4 and 2/3, It is cylinders 2/3 that stopped firing. I wasn't getting a spark from either plugs 2/3, but when i swapped the wiring of the coils over, I got a spark, so there's no problem with the coils. I then tested the wires that lead from the cdi unit to the coils, and all wires are fine. Therefore I figured the only thing it could be is the cdi unit. I ordered a new one and plugged it in and it started, all exhaust pipes got hot and I sighed with relief! During the time it took me to attach the cdi unit to the bike, it has returned to only firing on 2 cylinders again!!!!!!! If there is any advice you can give me, if someone has experienced something like this before? I would really appreciate it!! Thank you, Tim