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Old 31 December 2008, 18:31   #1
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yamaha 225 4 stroke overheating

for all those who have a 2003 225 4 stroke yamaha.. there is an overheating problem that is created in the mid section. corrosion of the plates require a full rebuild of the mid section.. you need to make sure the replacement plates match 100%. check and recheck..

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Old 01 January 2009, 00:00   #2
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Midsection? Plates?

Are you talking about within the powerhead itself? Where is the midsection? And what plates might those be?

jky
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Old 01 January 2009, 06:45   #3
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Sounds like a similar problem to one some of the Merc 60-115hp 4 strokes are having-corrosion around a grommit on the top of the water pickup tube reducing flow.
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Old 02 January 2009, 06:59   #4
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Quote:
Originally Posted by jyasaki View Post
Midsection? Plates?

Are you talking about within the powerhead itself? Where is the midsection? And what plates might those be?

jky
the power head sits on the mid section and the lower end mounts to it . the lower end drives the water up through the mid section into the power head. on 2003/04 there is a metal gasket that corrosion eats away leading to exhust and cooling water to mix. this in turn eats away at the other bits. the engine cools at 2k but at idle over heats. the replacement parts need to be reviewed in detail since yamaha made different gaskets to solve the problem. i.e 2003 will not match with 2004 but 2004 were built in 2003 and the mix up begins...

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Old 02 January 2009, 13:47   #5
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Thanks for the explanation. Was this limited to the F225?

Parts diagram can be found here:
http://www.yamaha-motor.com/outboard/parts/home.aspx

Can't help with the problem, though, sorry.

jky
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Old 06 January 2009, 08:50   #6
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One of my friends has just had the issue you talk about on one of his twin 4 stroke Mariner 40's, turns out there is the correct way of fixing with a full strip down and replacing parts or you cut the rubber tube just down enough that you and slide another tube over the top with a clip to reseal it afterwards. Then with a drill bit remove the corrosion, slide the tube over the original tube and seal up.
I've not done this myself, just bar talk, but quicker to do and test that a full strip down and then wait 2 weeks for the parts.
Jelly
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