You don't need a special tool to check the float level.
You can measure it per manual specs, or you can just use a clear hose put in the secondary feed and run under the carb to the outside where you can see the gas level with it held up to the side of the carb.
I had YDIS issues that turned out to be a bad needle/seat. the little nipple had extended farther than it should it was next to impossible to adjust the float correctly.
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