Hello all iv just had my dt125r rebored and rebuilt after around 15 minutes of steady riding i left it ticking over after a couple of minutes the engine stopped it has now lost all of its coolant out of the exhaust port the shop has told me that they will have it in to look at it but i would like some thoughts before i get there do you think its the head gasket although it was new or may be a warped head or could it be some thing else .