Honda bf175 overheat alarm

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Nov 14, 2021
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2007 bf175
Ran aground on broken ground
Sucked up some mud
Floated back- tell tail was fine.
mean home no issue
flushed the motor and laid her up for a few months
First trip since, and runs fine on idle. Putted out and when I open the throttle I get an over heat alarm. Alarm goes off after 30 seconds.
I can get it on the plane by accelerating slowly and it runs fine (ran out for 40km wot) no issue
But on start up again the alarm sounds again.
About to pull apart to check water pump thermostats etc but fear a partially blocked galley. Any ideas?
 
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