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Author Topic: How hard of a job to do a compression test on a Mercury Optimax 90hp?  (Read 591 times)

lacofdfireman

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Looking at getting an 08 Tracker 190 with a Mercury Optimax 90hp motor on it with 300hrs.  They are asking $12k for the boat. The guy said he has a friend that could come by his house and the compression check for $30.  I'd figure there is more to it than that but maybe not.  Maybe that's the friend discount.  Or would you not trust them.   Also what kind of numbers would I want to see on each cylinder? 


What else would you want checked?  I've. Ever bought a boat with an outboard so asked my local marine dealer and they said they charge about $120 for a pre delivery check and that doesn't even include the compression test.    They said that's about another hour at $120.  So what would they check for the first $120 that would make it worth it?  I just figured the compression check,would be good enough.


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Princeton_Man

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #1 on: March 15, 2017, 03:51:09 PM »

Pull the kill switch (don't want it to start). Pull the plugs,  screw the adapter into each plug whole, attach the compression Gauge to the adapter,  crank the engine. Read the gauge. Repeat for each cylinder.

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« Last Edit: March 15, 2017, 06:51:24 PM by Princeton_Man »
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Princeton_Man

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #2 on: March 15, 2017, 03:55:55 PM »

Check the lower unit oil by pulling the  drain plug. It's 90 weight so it won't come pouring out with out the top plug being out. If there's water in the grease it will be gray or milky. That means seals are leaking.

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Lee Smith

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #3 on: March 15, 2017, 05:21:44 PM »

Also check the wiring, un plug a few connectors and make sure there is no oil in the wiring harnes, that one will bite you in the butt  :surrender:
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lacofdfireman

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #4 on: March 16, 2017, 01:02:30 AM »

Photos from the compression test.   What do ya think?








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Kris

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #5 on: March 16, 2017, 04:32:25 AM »

Looks like 120,120,110.  In the automotive world of four strokes all cylinders within 10 percent high to low would be ok.  In an Optimax 2 stroke that may be different.  I am sure one of the other guys with more Mercury experience will chime in shortly.
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Oldfart9999

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #6 on: March 16, 2017, 05:57:55 AM »

Those look good, did you check the lower unit fluid like PM said? I'd do it. Ask to hear it run, all that needs to be done is hook up a pair of muffs and a hose, see if it idles nice and shift it, if all is good I wouldn't be worried about the hours. If you do get it be ready to change the impeller, lower unit fluid and plugs. I would look the wiring over closely to see if there is any cracking or rot.
Rodney   
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Princeton_Man

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #7 on: March 16, 2017, 06:37:06 AM »

Those look good, did you check the lower unit fluid like PM said? I'd do it. Ask to hear it run, all that needs to be done is hook up a pair of muffs and a hose, see if it idles nice and shift it, if all is good I wouldn't be worried about the hours. If you do get it be ready to change the impeller, lower unit fluid and plugs. I would look the wiring over closely to see if there is any cracking or rot.
Rodney

X2
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fishandkamp

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #8 on: March 16, 2017, 07:39:25 PM »

Those numbers look real good to me. My 20002 75 2 stroke has about the same compression numbers and it runs great.
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lacofdfireman

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #9 on: March 17, 2017, 01:26:24 AM »

X2


What does it cost to have the lower unit oil changed and the impeller etc?  Is this a dealer item or can it be done by me.  I'm totally new to outboards. 


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Princeton_Man

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #10 on: March 17, 2017, 05:01:36 AM »


What does it cost to have the lower unit oil changed and the impeller etc?  Is this a dealer item or can it be done by me.  I'm totally new to outboards. 


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If you're mechanically inclined, it's not a hard job. Lot's of DIY videos on YouTube. To have a shop do it will probably be around $150-$200 depending on labor rates. I'd suggest watching it being done on your motor first if you plan to do it.

I assume LU oil looked good? Did you make the deal?
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Oldfart9999

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #11 on: March 17, 2017, 06:35:59 AM »


What does it cost to have the lower unit oil changed and the impeller etc?  Is this a dealer item or can it be done by me.  I'm totally new to outboards. 


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Like PM said, if you are mechanically inclined then the fluid is very easy to do and the impeller isn't bad if you take your time and have a way stand up the part of the lu you pull. A ton of youtube videos are out there to show you step by step.
Did you get the boat, we need pics lots and lots of pics, we live on boat pics this time of year.
Rodney
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lacofdfireman

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #12 on: March 20, 2017, 02:59:26 PM »

Well that one is sold and gone so still looking.     Bummed.  Really liked it.


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Princeton_Man

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #13 on: March 20, 2017, 08:07:14 PM »

Well that one is sold and gone so still looking.     Bummed.  Really liked it.


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 :( Sorry to hear that. Sounded like things were good...  I was expecting to hear you made the deal.
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lacofdfireman

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #14 on: March 21, 2017, 01:06:50 PM »

:( Sorry to hear that. Sounded like things were good...  I was expecting to hear you made the deal.

Ya I was pretty bummed out but another one will come along I'm sure.    I'm just really surprised how hard it is to find a 17-19ft bass Tracker with a motor bigger than a 60hp.  Almost all I look at for sell have a 40,50 or 60hp.  I mean is that enough?


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hughesjasonk

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #15 on: March 22, 2017, 06:13:03 AM »


What does it cost to have the lower unit oil changed and the impeller etc?  Is this a dealer item or can it be done by me.  I'm totally new to outboards. 


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A 2 stroke boat motor is an overgrown weed eater. everything you can do on a weedeater, you can do on a boat motor to include change the lower oil.

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hughesjasonk

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #16 on: March 22, 2017, 06:15:24 AM »

Ya I was pretty bummed out but another one will come along I'm sure.    I'm just really surprised how hard it is to find a 17-19ft bass Tracker with a motor bigger than a 60hp.  Almost all I look at for sell have a 40,50 or 60hp.  I mean is that enough?


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I wouldn't go less than 50hp personally.

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lacofdfireman

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #17 on: March 22, 2017, 04:35:39 PM »

I wouldn't go less than 50hp personally.

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Have a deposit on a boat with 60hp.  It was everything I wanted in a boat besides the motor size.  I'd have really preferred a 75-150hp motor but for my first boat maybe this will be just good enough.   Guess I'm about to find out.  Wish I didn't have to work for the next 5-8 days. 


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hughesjasonk

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Re: How hard of a job to do a compression test on a Mercury Optimax 90hp?
« Reply #18 on: March 22, 2017, 04:46:28 PM »

Have a deposit on a boat with 60hp.  It was everything I wanted in a boat besides the motor size.  I'd have really preferred a 75-150hp motor but for my first boat maybe this will be just good enough.   Guess I'm about to find out.  Wish I didn't have to work for the next 5-8 days. 


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You should be able to get on plane no problem and cruise high 20s low 30s

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