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Yamaha 225 exhaust corrosion issues

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Yamaha 225 exhaust corrosion issues

Old 10-20-2020, 09:30 AM
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Default Yamaha 225 exhaust corrosion issues

Hello to all,
This is my first time posting a question, so I hope I am following the correct protocol.
I have a 1990 Grady White 280 Marlin; it has 2003 Yamaha 225 4 stroke outboards (F225TXRB and LF225TXRB). For a number of reasons, the boat was not used much until recently.

Last summer, I decided it was time to use it or lose it. So I took it to a local Yamaha dealer to go through the engines. At that time the engines only had about 50 hours. Replaced water pumps, timing belts, plugs, oil, filters, etc. I took it to the keys for about a week. I blew a Teleflex steering hose, but got it replaced and overall the boat ran pretty well for sitting as long as it had. When I got home I pulled the fuel tanks, one was leaking. So earlier this year I replaced both. This was quite a project, but worked out well in the pandemic shutdown. I also replaced the old Robertson autopilot and Furuno FCV-552 with a Garmin 942.

I made a couple of sea trial runs, boat ran well. So I took it to the keys for 3 weeks this summer. I had no problems at all with the engines; they ran great. But since the engines now have 165 hours, I decided it was time for the 100 hour service - fluids, filters, water pump rebuild, etc. I took the starboard apron off to drain the engine oil, noted a line of scum at the waterline. It wipes right off, but I decided to pull the port apron to clean it as well. It was then that I noticed the bonding jumper around the lower cushion mount to be obviously overheated. Both engines have exactly the same issue. None of the other bonding jumpers on either engine show this condition.

I have seen posts on THT regarding overheated ground wires; the common failure is in the trim/tilt system. However, I have had ZERO problems with the trim/tilt on either engine. I left the engines trimmed down (in the water) because we were using the boat every day. So I have a hard time imagining that BOTH engines have the same failure of the trim/tilt electrics that caused the bonding jumper to overheat.

I have pulled the lower unit on the port engine and it appears to have the same kind of exhaust corrosion as seen in photos on other posts on this subject on THT, maybe just not as advanced because of lower hours. The paint appears to be flaking off, I assume this is just the nature of this issue. The corrosion almost looks like an electrical discharge, like someone was briefly touching a welder to the metal. This has me wondering if the overheated bonding jumpers are somehow related to this. Would larger (and more) bonding jumpers help?

I am resigned to having to bite the bullet and replace the exhaust system with the Yamaha retrofit at some point. I am hoping to get some more hours on the engines before I have to do this. How many hours can I realistically expect before this should be done?

I have attempted to post some pictures but I get a message that I am not allowed to do so until I have 10 posts.

Any thoughts would be appreciated.










Old 10-20-2020, 11:12 AM
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If your planning on keeping those engines, gets the engines inspected, if confirmed it is the exhaust corrosion, then donít wait, bite the bullet and get it done. Itís not a consumable repair or maintenance like a belt or oils etc, itís a repair for a defect. You will only have to do it once, so if your paying all that money, you may as well do it now before it gets worse and potentially causes engine damage
Old 10-20-2020, 12:16 PM
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do a search, tons of info on this
Old 10-20-2020, 01:47 PM
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Did I read correctly 50 hours on 2003 model year engines?
Old 10-20-2020, 01:57 PM
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By all means, have the exhaust kits installed now, do not wait.

About $600 for the parts and $2,000 labor for each motor.
Old 10-20-2020, 02:32 PM
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Yes, engines had 50 hours in early 2019. You could certainly argue that I should have gotten rid of the boat years ago but I just couldnt let go; I have owned it since it was new. Boat is stored on trailer in a garage.
Engines now have 165 hours.

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Old 10-20-2020, 04:03 PM
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Originally Posted by MikeBailey2543 View Post
Yes, engines had 50 hours in early 2019. You could certainly argue that I should have gotten rid of the boat years ago but I just couldnt let go; I have owned it since it was new. Boat is stored on trailer in a garage.
Engines now have 165 hours.
I find it hard to believe that youíve got exhaust corrosion with so few hours, you got any pics?

As for hours, when the exhaust corrosion becomes critical, thatís not a hard and fast number. Some engines have gone into the 1000s hour range without. I did mine at 650 hours in a 5 year old engine. Youíve got a lot of years and not a lot of hours, youíre situation is a bit odd with so few hours. If usage remains the same, at 10 hours a year average, I would take my chances and just keep going.

Last edited by Mpellet; 10-20-2020 at 04:21 PM.
Old 10-20-2020, 04:14 PM
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Originally Posted by Tom W Clark View Post
By all means, have the exhaust kits installed now, do not wait.

About $600 for the parts and $2,000 labor for each motor.
Dayuuum. What are the shop rates?
Old 10-20-2020, 04:36 PM
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Originally Posted by Mpellet View Post
I find it hard to believe that youíve got exhaust corrosion with so few hours, you got any pics?

As for hours, when the exhaust corrosion becomes critical, thatís not a hard and fast number. Some engines have gone into the 1000s hour range without. I did mine at 650 hours in a 5 year old engine. Youíve got a lot of years and not a lot of hours, youíre situation is a bit odd with so few hours. If usage remains the same, at 10 hours a year average, I would take my chances and just keep going.
My 2005 F-225 had it at 185 HRS. !! Along with the Powerhead!
Old 10-21-2020, 07:04 AM
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Originally Posted by alloyboy View Post
Dayuuum. What are the shop rates?
Thats the exact quote I got, which included checking the block. Rate was $90/hr most other shops around me were $150/hr. The cheaper guy is actually more recommended than some of the more expensive shops in this case but I did a lot of asking and shopping around.

OP - if you plan to keep the boat do the exhaust and be done. If you ever try and sell thatís one item on even a good boat/hull that everyone will ask about if the see a yamaha f225...Iím going through that side of it now

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