Its more about seeing the actual level of GAS in the float bowl while running, since that affects the lean/rich fuel mixture. Measuring the float height upside down is a good starting point, but with bent, non stock floats etc, I want to know whats REALLY going on.Rob, just make a gauge from stainless or thick plastic (that doesn't react to fuel), per the guidance in the Honda Service manual. Then, you can hold the float up with it and open the petcock. If you get more than a very slow drip, the float is too low; if you have to lower it more than a hair to get some flow, it is too high. Snap the bowl back on, and done.
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That 20.0 is the measurement to the step part of the slot. Just cut the rest to span the bowl seat, and the deeper step to clear the jets. See P. 53 of the service manual, paragraph 3.6.B.5