My rpm warning alarm sounded off (over 6000 rpm) on my last trip out with my 4 stroke Mercury ,have any of you had this happen.It was wide open when it was doing it and as soon as I backed down the throttle a bit it went off and was fine,it has never done this before.I am going to take it to the dealer tommorrow to see what is going on and figured I'd post this and maybe get a heads up on what might be wrong.