Thread Tools Search this Thread
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: 122
Yamaha exhaust ports

Click image for larger version

Name:	ImageUploadedByRIB Net1443104943.113329.jpg
Views:	72
Size:	54.7 KB
ID:	108874

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: 4,850
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

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 22:45.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.