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Old 05 May 2014, 14:07   #11
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Checked the head gasket while running for leaking gases but seems fine. No sign of water in the fuel but a lot of dirt. This may account for the loss of power at full throttle but would it also cause the white smoke/steam from the exhausts?
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Old 05 May 2014, 14:28   #12
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The head gasket also keeps the cooling water from getting into the cylinder bores. This failure wouldn't be seen on the outside as a leak but would produce lots of white smoke.

You have to remove the head to see for sure.
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Old 05 May 2014, 14:35   #13
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Sounds like head gasket. If used in salt water take plugs out after you have run it and see if there is a build up of crystallised salt around the electrode.

I had similar with a 50hp years ago.

Good luck
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Old 05 May 2014, 15:46   #14
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No signs of salt on the plugs or water in the engine oil.
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Old 05 May 2014, 16:25   #15
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If the oil looks normal the head gasket's probably ok. I'd look at overheating more thoroughly, check thermostat in hot water with a thermometer. Then check that there's no crud in the cooling passages.
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