From what I have read on this forum, it really varies from car to car. The one thing that seems consistant is cooling system pressure when cold, as in the next morning. The system will come up to pressure rapidly, prior to the coolant temp being high enough to be causing the pressure increase. (Dave M. has contributed a lot of info concerning this issue, if you have not read his posts, a search of GSXR is well worth the time. Thanks, Dave.)

My car started to run a bit warmer then normal at idle. It was irratic, sometimes staying in the same range as normal, other times it seemed just a tad higher then it should be. The first real tip was the hard rad hoses when cold, then I noticed it started to climb too rapidly at idle. Eventually it ran too hot, (not overheating) but just too hot for a 603 in good trim, and then it started to use some coolant, this was erratic as well, but once it was obvious it was going through coolant, I parked it. (Once the system goes into this mode, it can no longer recover coolant from the catch tank, unless you pop the radiator cap as soon as you shut down, so that as the system cools it can pull a vacum.) Popping the radiator cap on shut down will temporarilly elliminate most of the symptoms.