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Overheating 2021 300HP Mercury outboard

snapper123

New member
HI, our 300HP outboard has started overheating and going into limp mode, the temperature on the simrad shows it creeping up to the 90 C area. This happens after first start and as I use tick over to exit the harbour. It can be prevented by putting the engine in neutral and holding the revs high for a few minutes. Is this normal? it didn't do it for the last six months, any thoughts? Airlock? Thanks in advance.
 
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