I was wondering if I have over thought this. No.... I realize I have. My various manuals state a float bowl height for different bikes. As I was trying to find a float height online for a manual I don't have, I gave up and starting thinking, Are they not always set parallel to the bowl cover mating surface? If they were not then the position you measure from would read different almost every time. The manual would have to state an exact point from which to measure. LOL, I laughed at myself because I rely on my manuals to much, letting it over ride common sense.