I have a 1988 125 Force. Twice today the overheat alarm went off about 5 minutes AFTER I had stopped the engine. Is this an indication of a water pump going bad? I know an engine will heat up slightly after it is stopped, but I've never had the alarm go off like this. When stopping, does it matter whether I kill the engine quickly or power it down slowly as to how much heat will build up after it stops?