Here is Mark's picture of the float. I have circled in green, the tab that is usually used to adjust float height - I'd need to look at the carburetor to be sure, but I think that Mikuni adjusts the usual way, by bending that tab up or down:
[Linked Image]

[Linked Image]


Here are two videos, one long and one short, that show you how to measure and adjust the float height:





The first one is a bit too short and the second one very, very long - it is a good-quality video of an actual trade school training session on setting small engine float heights. If you watch them both and come back with any questions, hopefully we'll get this clear.