Quote:
Originally Posted by ApS
British cars solved a "hot carb" problem with a sandwich of aluminum and asbestos to isolate the carbs from the hot manifold.  Described back then as a "heat-shield", I made one for a modern fuel-injected BMW. 
Pop-rivet two pieces of aluminum and one sheet of asbestos together. It was only 3/16" in thickness—with the overall size of a large postcard. It can then be slipped and glued into the problem area. Instead of using asbestos, there's non-asbestos gasket material—available in rolled-up sheets.
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I have a feeling the resonator melted from within. Sounds like water stopped flowing for some reason, may be a design defect. Seadoos have always been ahead of the curve for being quiet using a series of baffles and chambers, some are made of plastic and probably need to be cooled to stop melting.