with a 1998 an overheating problem should give off a certain beep for it......When you rebuilt the carbs did you completely pull everything apart and clean it along with cleaning the jets and changing the internal filters? If you also have the grey fuel lines go ahead and replace them quick as if not now they will end up giving you problems soon, turn your fuel selector switch to reserve and see how it runs after that, go ahead and replace the inline fuel filter as well and clean any junk out of the plastic bowl.