I took the top of the air box off to watch the carbs. As I roll on the throttle vacuum slides go up and down quickly like more of a vibration of maybe 3-4mm. The carbs don't seem to have the jet holes in the round wall of the carb, but on the vacuum slide. I see gas come out of where the jet needle is vibrating in and out of, but not from the pin holes on the slide. My Clymer manual says Kawasaki doesn't recommend the use of carb cleaner, but use simple green and gas...?