So, I've been getting my WR450 ready for my first real woods ride tomorrow and decided to change oil, clean filter, etc. beforehand. I started my bike to let it run (approx. 5-10 minutes) and when I shut it off the radiator fluid was boiling in the overfill resevoir and then spit out the bottom through a hose. Is this normal in warm weather? It's been in the mid 90 degrees here in MT lately and was about that temperature when I was working on my bike. I thought maybe there was an air bubble in the coolant line's, so I drained all that and re-filled per owner's manual. Should I be concerned about this, or was a big reason why this was happening was because of no air going through the radiator? Can anyone help me? I've searched other threads and could really find the same scenario.