Hi I am new to this forum and would appreciate any advice. Only at idle does my jet ski Overheat. I have done just about everything I have researched to remedy the problem and have had no luck. No lines are clogged. Pump appears to be clear of any debris. Oil is new. Plugs are new. Gas is fresh. Darn thing pisses steam lights start flashing and alarm sounds. After 10 minute cool down she runs fine again until idle after 5 minutes or so.