1993 115 yamaha alarm goes off turn off and alarm gone

[andos4]

Hello just wondering I have a 1993 yamaha 115 2 stroke and on the weekend in rough weather and trailing sea the alarm sounded in the control box. I stopped turned off and it was ok to go again. just wondering if anyone has any ideas where to start to trouble shoot please.
A little more information, I just replaced the oil control unit and am thinking it may be the problem as it is a newer version of the original. The heads were cool enough to touch when the alarm went off.

[boats.net]

Do you have Yamaha gauges with warning indicators? What warning light came on?

[andos4]

Did not take much notice I know I should have I did notice that the trim indicator was seized when I got home can this be part of the problem do you think?

[boats.net]

It could have been engine overheat alarm or low oil level in engine oil tank alarm, check oil system to see if working properly.

[andos4]

I just took the boat for a run the alarm seems to come on at higher revs there is no indications on the dash just the revs drop and its good to go again in a couple of minutes.

[DrumFish Charters]

Water Impellors or thermostat

I had a similar with my 90 150 v6 I changed the thermostat and the impeller and the issue went away, Also check that your water intake vents are not clogged with seaweed or other foreign matter.

Hope this helps....