I am not an expert on carbs, so when I removed and cleaned the carb I was none the wiser as to anything missing. Adding fuel down the spark plug holes was a friend's suggestion that made no sense, but I went ahead anyway. Not sure if that helped it start that one time or not. In any case, my Kawasaki dealer is fixing everything and I hope to have a running bike in the next few weeks.You said you took the carb apart twice. Did you not notice it missing jets or needles? Missing either one of those will not cause it to not get fuel, it will cause it to get so much fuel that it floods the cylinders. If adding fuel into the cylinders got it to fire, that doesn't make sense.