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Winterize 525's

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Old 09-26-2009, 06:13 PM
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OK - I am going to have a mechanic winterize the boat this winter to understand these engines. Just to educate myself - there are two plugs on the headers, one on fuel chiller and power steering cooler. Any others?
I said two on each header rail. But 25 got it right.

And I forgot to mention about fogging. Do that while you suck the antifreeze in. That's the beotch because you have to pull the fuel filter....drain half the fuel out...and fill it with 2 cycle oil. Then hook a 5 gallon bucket (full of Banfrost) up to the fresh water flush and let her run until empty. Done!

I'm no motor head by any means, but this is one thing I have always done myself. You should too. Buy some beer and get a buddy to help you.

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Old 09-27-2009, 05:57 AM
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There was a thread on here last year about using an outboard 5 gallon fuel tank plumbed into the fuel supply line, filled with fuel/stabilizer/2 cycle. I used this method last year, worked great to take care of the fuel system.
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Old 09-27-2009, 08:30 PM
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yes you are right ....6 plug total
6 plugs per motor? I have only 1 on each header
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Old 09-27-2009, 08:36 PM
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6 plugs per motor? I have only 1 on each header
My 2006 525 EFI ...6 plug ...three on this side
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Old 09-27-2009, 08:38 PM
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5 gallon fuel tank plumbed into the fuel supply line, filled with fuel/stabilizer/2 cycle. .
Work great , is how i do mine since 2006 ...
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Old 09-27-2009, 08:46 PM
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Work great , is how i do mine since 2006 ...
THANKS for pic
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Old 09-28-2009, 09:56 AM
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Do your self a favor and go to your dealer and buy 3-4 of those little blue plugs and the o rings. From heat cycling hot and cold they can become very brittle. You can crack them removing them and not even be aware of it. Then the thumb screw part on top cracks off leaving a water leak. Have had 2 do that on or 700's. Its cheap insurance to carry a couple in the boat.
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Old 09-28-2009, 08:02 PM
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Yup, I had some break on me. I filled the open end of the new ones with epoxy, never happened again.
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Old 10-03-2009, 03:37 PM
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I know this is a bit off topic, but stick with me. I just put a new set of CMI headers (OUCH) on my 525. Some of the fittings were different on the new headers ? I am told in about 2007 Mercury Racing decided there wasn't enough water going through the the headers. In short, I had to remove the (bypass) hoses from the header manifold to the tailpipe and plug both and drill out a restricter in the stb. side. I see in Christian's picture the bypass hose is still installed (left). I'm not sure witch engines this applies to so check with somebody knowledgeable for more info. Doug

Last edited by outriggers; 10-03-2009 at 03:41 PM.
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