Hi guys, I was riding at the track yesterday and after about 2 hours of riding I noticed coolant coming out of the overflow tube, and only the overflow tube. I let the bike cool down, dumped some water in there, took another lap, and there was nothing above the fins in the radiator when I checked again. My oil is fairly milky, but it has always been that way. I was thinking it was a seal around the impeller shaft. Am I correct or is it a head gasket? Thanks!