If memory serves me right the '93 600's had mad problems with the carbs. You could try adjusting the idle speed, but more than likely you have to clean/rebuild the carbs.



Although what you're describing almost sounds like a heat soak issue. I can't remember if the intake is run over the top of the motor or not... But that may be your issue as well.

Sorry for not being much help... Your bike is even older than when I was riding... Lulz.