Hello, I would appreciate anyone's past experience with this problem to make sure I am looking for the right thing. I just bought a YZ426 '02, it runs awesome but coolant was low. I filled it up then when I started it blew white smoke but only on start up, white oil drips out of the breather hose. The dipstick oil is fine though, does this tell me it must only be the head gasket and nothing more? I hope thats all it is!