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See post #33 (above) from Ian. Quoying: "Have your mechanic remove the extension housing and check the grommet on the water tube where it enters the oil pan? Your symptoms are typical of an intermittent overheat which can be caused by this."
See item 6 in link. You need to remove the lower unit and mid section ( extension case) to get to the oil pan. Then inspect the grommet where the water tube enters the oil pan.
https://www.boats.net/catalog/honda...5-la-vin-bagj-1300001-to-bagj-1399999/oil-pan
It's a fairly straight forward job, just remove the gear case, lower mounts and then the ring of bolts holding the midsection onto the mountcase, and that's it.The shift shaft will just need a firm tank to remove, it's held in place with a little spring clip.
Here is a link to the picture... I can't post a picture:
https://drive.google.com/file/d/1aFUfA1ShbnoGAlLE4cVIRZxsfqc8GniT/view?usp=sharing