The float height can also contribute to "bad fuel mileage" by letting the bike piss the fuel out of the overflow tube when the bike leans, goes up or down a hill, or just lets extra fuel into the crankcase when it doesn't need it.
It is easy to set the float level. The hard part is taking off the four shitty pot metal screws on the float bowl and not stripping them out with the screwdriver.
I had a KDX years ago where the float was too high. At idle and coasting the bike would load up. I kept going leaner on pilots, needle, air screw, until it bogged badly when I opened the throttle up. The problem turned out to be the float. Jetting was very lean, however was masked by the "flooding" that was happening due to the float height being waaaay too high.
Fixed that and the bike ran good.
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