I posted a couple of weeks ago about how my WR400 is shooting coolant into the resevoir. I got a few suggestions that I should change out the radiator cap because it could be old and worn. So I did that and it is still doing the same thing. My roommate is telling me that it is probably my head gasket (I re-used my old ones since I was in a bind). They are cometics, so i figured it would be okay. I'm think that may be the problem, but I want to rule out any other possible alternatives that could be causing my problems. Anyone have a clue? The coolant is not returning back into the radiaotrs, it just sits in the resevoir once it's in there. I'm running engine ice on a 2000 WR400 and it is currently 90* here. Any and all help is appreciated!