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Old 24 September 2015, 14:36   #1
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Country: Ireland
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Yamaha exhaust ports

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I've looked through a lot of documents online but can't find anything about the two ports with the arrows pointed at?

What is the function of both of them as I though the exhaust gasses were supposed to go out around the propeller...

I ran the engine in a barrel for an hour and there is a little smoke/ steam from the top port, the port doesn't get hot but if you block both of them for a few seconds then the bubbles come out from the vent over the prop over the cavitation plate

How much smoke/ steam is ok? Should it have gone away after she heated up?

Sorry for all the questions :-(


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Old 24 September 2015, 16:22   #2
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Most outboards have them, they allow the engine to run while the boat is still without causing much exhaust back pressure.
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