I have that same issue. I even brought the bike to the Kawasaki dealership for the beginning riding season. Dropped a grand. Carb rebuilt, tires and inspection. Bike was running very well. It hydrolocked on me. So I drained the oil and changed the filter, which was done prior. Changed the petcock. It ran well again for a 1k. I got in the habit of turning off the fuel when I park it and I forgot to turn it on one time and it must have thrown the carbs out of sync and now she turns but won't fire. Frustrating!! I'll let you know what I find when I figure it out.