We, at the factory, found a better way to hold the carb for float level checking, on the carb's side.
As to measuring liquid level, you don't need a clear plastic float bowl, a spare stock bowl will work just fine when modified correctly. inside the float bowl is a brass over flow tube. Remove it by simply pulling it out of the bowl. Then, on the bottom of the bowl where the over flow drain is, press a section of the over flow tube into it, and add a section of clear plastic tubing. To measure the liquid level, hold the carb straight up and down with the open end of the clear tube above the center of the carb, and add fuel through the fuel hose fitting. The fuel will seek its level in the clear plastic tubing. Adjust from there.
On adjustment, to each their own, do it as you please, but realize that some setups we read about as just plain too rich, haven't had any float level/liquid level adjustment and the fuel level inside the carb is just plain too high, causing the richness, no matter the jetting used.
On every G, A, S, H series, and 4 stroke Kawasaki carb I ever saw, the float levels were all too high from the factory, and when not set correctly, caused the engines to run between slightly, to excessively rich, until set right, especially when those carbs were Mikuni's. Yamaha and Suzuki had the same problems as well. Keihin's on Honda's were usually set very well.
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