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Old 24 September 2015, 09:36   #1
Ron Noco's Avatar
Country: Ireland
Town: Kerry
Boat name: Independence
Make: FunYak
Length: 4m +
Engine: Honda BF10
Join Date: Jun 2015
Posts: 123
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 :-(


Ron Noco is offline   Reply With Quote
Old 24 September 2015, 11:22   #2
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,040
Most outboards have them, they allow the engine to run while the boat is still without causing much exhaust back pressure.
jwalker is offline   Reply With Quote

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