my cbr 600 is in the garage for the winter. temps have been below freezing lately. i get on my bike and start it up once a week to keep the battery alive because I don't have a tender. today I let it run for like 10 minutes and revve'd it just a little (i couldnt resist) and when I got off I noticed some green liquid (coolant?) on the floor under the front end. WHAT DOES THIS MEAN!?!?!?