Float height is not to be messed with. The factory spec. setting is the only setting that the carb is designed around to deliver correct fuel/air ratios across the bikes performance range...... should never need to be adjusted, just some folks can't help themselves move it away from spec. so yes, it should be checked.
If a bike has been modified, such as porting, larger valves, less restrictive exhaust, overbore, and different cam, would this still hold true? Or is that a whole other ball of wax, where you start from factory spec and move on from there?
Yes, it still holds true. What you have listed ^ requires the volume of gas supplied(jets/needle clip position) to change, not so much the level of gas in the bowls. The LEVEL of gas is the goal. This level adequately covers the jets for proper fuel supply. We need to verify this height recommended by Honda, is still correct, and not been messed with by someone before us. Its an easy thing to check as you probably know. Only seconds to verify someone before us didnt mess with them. Then they rarely need to be checked/adjusted again.
The only way to verify our floats are achieving a fuel level adequate enough to cover jets and not overflow, is the clear tube method. It is only intended to check fuel level in the bowl, and the integrity of the float if/when it is properly set/adjusted.
