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Engine overheating alarm goes off. Cooling water ok , oil ok . What can it be

Hallo

I,'m tim from the netherlands .

I have a mercury 60hp 4stroke carb.

The problem is That the engine on most random moments goes into overheating alarm en cuts power. When i restart after alarm it sometimes goes in alarm in 1 minuten. Or it goes well for the rest of the time .
I know that the piehole from the Collins water is modified to 7mm becaus the previeus owner had mud problems.

But it cools great

But what can it be . And what can i test to know whats wrong
 
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