I guess the black one that I have is aftermarket or from another model. I wonder if there's a big enough difference in bouyancy to affect the fuel level. Factory white floats are still available but they're $40-$50. Does anyone have the spec for what the fuel level should be? I've used the trick where you put a piece of clear fuel line in the drain spigot of the carb, run the line up the side of the carb, and turn on the fuel to see where the fuel level is in the bowl.
If I could use this to set the float height rather than a static measurement I should be able to compensate for any difference in bouyancy, but my manual doesn't give the fuel level.