I haven't worked on a honda quad carb, but I deal with Honda powered small equipment evey day. The biggest problem I deal with is gas leaking through the carb into the cylinder. Honda tells me that it is caused by the float bouncing around when the equipment is being transported. Once the needle/seat is messed up, the only thing you can do is keep the gas turned off when not in use, or replace/repair the carb. As a preventive messure, turn your fuel off during transport and run it out a little to reduce the bounceing on the float.
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