Check adjustment of gear control/throttle control.
3 outboards here none of which make any discernible gear noise when the prop is spun by hand in neutral.
I suspect the adjustment is just verging on going into either ahead or astern, wriggle the control into astern and back into neutral and test, then control into ahead and back into neutral and test.
If meshing sounds still persist after one or the other it tells you which adjustment to adjust .
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