Hi Parmalee, i have no idea what kind of system your bike runs, but my Impala has a pressurized system and reverse flow cooling. So it cools the heads first and then the block. At any rate it has a reservoir with a 15psi cap, there is no radiator cap on the RAD itself.
It is normal on my car for fluid to act as you describe, in fact the markings on my reservoir say "full cold".
My guess is nothing is wrong, or you have a tiny bit of air in the system and need to bleed it, but if that were true i suspect the motor would be running a little on the hot side.
EDIT: found a pic actually....
http://carphotos.cardomain.com/image...0/19130608.JPG
Good Luck.
-ALF out...