More important would be the actual fuel level measured with a fuel level gauge. I set my (98 kx250) float height based on the manual (clymer) @the same 16mm. It was previously set much closer to the carburetor body (higher fuel level) and after 2-3 laps of practice @ my local 1/4 dirt track the engine would not pull because of a lean bog. In between practice and heats I had to raise the fuel level to where it was set previously then all was okay.