Setting float level is key to any carb tuning, for sure. The PHH allows you to set the float level very easily at the fuel inlet. Others here have manufactured their own factory float setting jig, but that requires removal of the carbs. Essentially, the fuel level should be midway in the body of the carb, as seen in the second picture. There is actually a float level mark on the outside of the carb body, between the two throats.