So, my bike has been slowly loosing coolant, i have overheated it twice. I was out at the dunes this weekend and saw that as i stopped and killed the motor coolant would be dripping out of the overflow tube. I do not idle it for long periods of time or anything. my friends yz450 does not do this. Could this be happening due to a warp cylinder head, it could have gotten warped when i overheated it. What is causing pressure in the coolant system to force it out the overflow tube??