Can anyone post a pic of a clone carb and show me what part of the carb is the venturi bore, or where it is located? Im trying to check a carb i have and see if it is a .575 or .615 carb but have no idea where the venturi bore is. Is the venturi the tube that you screw the main jet up into, and those 2 holes on each side of the bottom of it would be considered the bore?