Re: HOw to check float on 88 Zuke
Adjusting the float on the stock carb basically requires tearing apart the carb. I adjusted my float during a carb rebuild. Instructions were provided with the carb rebuild kit. If I recall correctly, they were similar to the instruction found in the Haynes and/or Chilton manuals. I would suggest getting my hands on one of these instruction sets since they go into the float adjustment in good detail (including correct float height adjustment).
I think you may be able to take the air horn off without removing the whole carb, but it is probably just as easy removing the whole thing so you can clean things out while you're at it. The carb consists of 3 pieces. The air horn holds the choke flap and fuel inlet fitting. The middle piece holds the jets and fuel bowl (including the fuel level window you mentioned). The bottom piece holds the throttle plates. The air horn is held onto the carb by several screws.