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Can I Replace the Power Head?

Q

quantum74

New member
Hey folks, looking for some opinions. I'm a handy guy, do my own car maintenance, fix things around the house, etc. I'm not a mechanic other than brake changes, oil changes, etc. general maintenance.

I have a 2004 Mercury 90 HP 2-stroke. I had issues with it and took it to a marina to get it check. Turns out, its a blown engine, and they said the power head needs replaced. This is something that I would like to do myself. Strip the power head, send it off to get it machined, etc. and replace it. I'm hesitant because I look at it and think I can do it, but looking for an idea of how difficult it actually is? I've looked a few YouTube vids, but nothing too informative. What do you all think?
 
Dont forget you need to find why it failed and correct that also.
Before I would tear it apart check compression, If that is even. I would look at the spark plugs. I am not going to explain oh how to read them but google can tell you.
With that said if compression is even. I would think the pistons and rings are ok.
If a reed valve was not sealing you would should have a missfire and etc.
It is lot of work to replace them.
If you want to do this on your own just buy the service manual.
 
eclipseguy said:
Dont forget you need to find why it failed and correct that also.
Before I would tear it apart check compression, If that is even. I would look at the spark plugs. I am not going to explain oh how to read them but google can tell you.
With that said if compression is even. I would think the pistons and rings are ok.
If a reed valve was not sealing you would should have a missfire and etc.
It is lot of work to replace them.
If you want to do this on your own just buy the service manual.
Click to expand...
Hey, thanks for the reply. I should have mentioned that compression is very low on the middle and bottom cylinder. Its been a while since I checked them. But the top is like 120, middle is like 35, and bottom is like 20.

I will definitely take your advice and buy the service manual.
 
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