Was out yesterday on my 03 ec 300 and it was cold snow still on the ground we were in forest with not much wind after about an hours riding I noticed steam coming from the overflow pipe from the rad when stopped I topped up the rad and held about 200mls of water but after about 10mins the bike started to put steam out again an was spitting the water out again. It was a lot of slow riding as I'm only getting used to it. Is there anything I can add to the bike to help cooling and wat is the best coolant+antifreeze to use. Thanks.