Sounds like your technique is off a bit, or the float needles needed replaced. I lay the carbs down so the floats close the valves and blow gently into the gas inlet and see if any blow past. I hate float problems, especially setting float height, and its super important for the carbs on my fzr, float height controls mixture for the pilot jets. I suggest you visit a cbr forum and see if someone he's done a carb cleaning write up. Every bike has its quirks and an owners forum is the place to learn about them.