Started my YZF 450 04 the other day in my garage and let it run for about 5 minutes. I noticed some green coolant started to leak out one of the pipes that hang out the bottom of the bike. This happened after about 5 minutes of the bike running stationary. Is this because it was starting to overheat and this is the overflow pipe? I am aware that the 450's can overheat quickly if you let them sit with the engine running. Is this all it was? I tried to look in the manual but couldn't find anything about the pipe that was dripping the coolant out of it.