I HAVE A CHRYSLER 55 HP SINGLE CARB , I BOUGHT IT NOT RUNNING CHANGED HEAD GASKET ,AND THERMOSTAT AND PLUGS ON THE FIRST TIME OUT SHE RAN LIKE A DREAM , BUT MUST HAVE PICKED UP MUD OR SILT FROM LAKE AND OVERHEATED AND STOPPED AND NOW I CANT GET HER GOING AGAIN . I CLEANED THE BARRELS BECAUSE...