Hi there I,ve used the plastic tube and a 1mm syringe [ tube no plunger] and cut another piece of tube that will go around the bottom of syringe and another piece cut to go 16mm above then all you do is line the cut piece of tube with level on carb and check level between the two cut pieces.
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weedeater fuel line is cheap you can get it at home depote for $5 in the plumbing section not the garden. With that small roll you can have all 4 carbs on at the same time make sure bikes level or the carb rack. When your done just plug one end onto the other carb next to it,discard the other 2 and you won't have to look for them if you need them again and it will keep dirt out of your drain tube.
