I just held up a ruler and eyeballed my float heights.

Is the gas cap vented? On vespas there's a little hole in the gas cap
to let air in as fuel is sucked out. If it gets clogged a vacuum
develops in the tank after a while that stops fuel flow.

-MAx

--- In vintagehondamotorcycles@yahoogroups.com, "lobstermobster777"
<lobstermobster777@...> wrote:
>
> The S90 is driving me up the wall and only want to run for about 100
yards and die. If I
> wait about a minute she'll crank right up and drive another 100
yards. I've tried messing
> with the float level but I don't have a good tool. Does anyone know
how to build a cheap
> DIY float measurement tool?