TOOK THE GEM OUT TO CONNECTICUT THIS 4TH AND WENT ON THE WETHERSFIELD RIVER.(FRESH WATER) THE TEMP ROSE UP TO 240. I SHUT HER DOWN AND ANCHORED FOR THE DAY. ON THE RETURN BACK I TOOK IT EASY. STAYED AROUND 230 STEADY WITH ENGINE C0VER OPENED. AFTER ABOUT 5 MINS I HEARD A SMALLL FIZZLE SOUND...